Require migration dependencies instead of assuming class will be declared

app/helpers.php

···
 use App\Models\LoginAttempt;
 use Egulias\EmailValidator\EmailValidator;
 use Egulias\EmailValidator\Validation\NoRFCWarningsValidation;
+use Illuminate\Database\Migrations\Migration;
 use Illuminate\Support\Arr;
 use Illuminate\Support\HtmlString;
 
···
 {
     return app('assets-manifest')->src($resource);
 }
+
+/**
+ * Get an instance of the named migration.
+ */
+function migration(string $name): object
+{
+    $instance = app('files')->getRequire(
+        database_path('migrations').DIRECTORY_SEPARATOR."{$name}.php",
+    );
+
+    if (!$instance instanceof Migration) {
+        throw new Exception(
+            "\"{$name}\" does not return an instance of ".Migration::class.'.',
+        );
+    }
+
+    return $instance;
+}

database/migrations/2016_10_28_000000_update_oauth_tables.php

···
      */
     public function up()
     {
-        (new CreateOauthRefreshTokensTable())->down();
-        (new CreateOauthAccessTokenScopesTable())->down();
-        (new CreateOauthAccessTokensTable())->down();
-        (new CreateOauthAuthCodeScopesTable())->down();
-        (new CreateOauthAuthCodesTable())->down();
-        (new CreateOauthSessionScopesTable())->down();
-        (new CreateOauthSessionsTable())->down();
-        (new CreateOauthClientGrantsTable())->down();
-        (new CreateOauthClientScopesTable())->down();
-        (new CreateOauthClientEndpointsTable())->down();
-        (new CreateOauthClientsTable())->down();
-        (new CreateOauthGrantScopesTable())->down();
-        (new CreateOauthGrantsTable())->down();
-        (new CreateOauthScopesTable())->down();
+        migration('2016_03_18_170013_create_oauth_refresh_tokens_table')->down();
+        migration('2016_03_18_170012_create_oauth_access_token_scopes_table')->down();
+        migration('2016_03_18_170011_create_oauth_access_tokens_table')->down();
+        migration('2016_03_18_170010_create_oauth_auth_code_scopes_table')->down();
+        migration('2016_03_18_170009_create_oauth_auth_codes_table')->down();
+        migration('2016_03_18_170008_create_oauth_session_scopes_table')->down();
+        migration('2016_03_18_170007_create_oauth_sessions_table')->down();
+        migration('2016_03_18_170006_create_oauth_client_grants_table')->down();
+        migration('2016_03_18_170005_create_oauth_client_scopes_table')->down();
+        migration('2016_03_18_170004_create_oauth_client_endpoints_table')->down();
+        migration('2016_03_18_170003_create_oauth_clients_table')->down();
+        migration('2016_03_18_170002_create_oauth_grant_scopes_table')->down();
+        migration('2016_03_18_170001_create_oauth_grants_table')->down();
+        migration('2016_03_18_170000_create_oauth_scopes_table')->down();
     }
 
     /**
···
      */
     public function down()
     {
-        (new CreateOauthScopesTable())->up();
-        (new CreateOauthGrantsTable())->up();
-        (new CreateOauthGrantScopesTable())->up();
-        (new CreateOauthClientsTable())->up();
-        (new CreateOauthClientEndpointsTable())->up();
-        (new CreateOauthClientScopesTable())->up();
-        (new CreateOauthClientGrantsTable())->up();
-        (new CreateOauthSessionsTable())->up();
-        (new CreateOauthSessionScopesTable())->up();
-        (new CreateOauthAuthCodesTable())->up();
-        (new CreateOauthAuthCodeScopesTable())->up();
-        (new CreateOauthAccessTokensTable())->up();
-        (new CreateOauthAccessTokenScopesTable())->up();
-        (new CreateOauthRefreshTokensTable())->up();
+        migration('2016_03_18_170000_create_oauth_scopes_table')->up();
+        migration('2016_03_18_170001_create_oauth_grants_table')->up();
+        migration('2016_03_18_170002_create_oauth_grant_scopes_table')->up();
+        migration('2016_03_18_170003_create_oauth_clients_table')->up();
+        migration('2016_03_18_170004_create_oauth_client_endpoints_table')->up();
+        migration('2016_03_18_170005_create_oauth_client_scopes_table')->up();
+        migration('2016_03_18_170006_create_oauth_client_grants_table')->up();
+        migration('2016_03_18_170007_create_oauth_sessions_table')->up();
+        migration('2016_03_18_170008_create_oauth_session_scopes_table')->up();
+        migration('2016_03_18_170009_create_oauth_auth_codes_table')->up();
+        migration('2016_03_18_170010_create_oauth_auth_code_scopes_table')->up();
+        migration('2016_03_18_170011_create_oauth_access_tokens_table')->up();
+        migration('2016_03_18_170012_create_oauth_access_token_scopes_table')->up();
+        migration('2016_03_18_170013_create_oauth_refresh_tokens_table')->up();
     }
 }

database/migrations/2017_02_01_105338_drop_slack_users.php

···
      */
     public function down()
     {
-        (new CreateOsuSlackUsersTable())->up();
-        (new ChangePrimaryKeyOnSlackUsers())->up();
-        (new OsuSlackUserMakeSlackIdNullable())->up();
-        (new AddIndexOnSlackId())->up();
+        migration('2016_02_27_103851_create_osu_slack_users_table')->up();
+        migration('2016_03_02_214730_change_primary_key_on_slack_users')->up();
+        migration('2016_03_03_223651_osu_slack_user_make_slack_id_nullable')->up();
+        migration('2016_03_09_083112_add_index_on_slack_id')->up();
     }
 }

database/migrations/2017_02_13_013536_delete_contest_vote_aggregates_view.php

···
      */
     public function up()
     {
-        (new CreateContestVoteAggregatesView())->down();
+        migration('2016_08_25_055700_create_contest_vote_aggregates_view')->down();
     }
 
     /**
···
      */
     public function down()
     {
-        (new CreateContestVoteAggregatesView())->up();
+        migration('2016_08_25_055700_create_contest_vote_aggregates_view')->up();
     }
 }

database/migrations/2017_08_28_110634_drop_beatmapset_discussions.php

···
      */
     public function up()
     {
-        (new CreateBeatmapsetDiscussions())->down();
+        migration('2016_02_29_052133_create_beatmapset_discussions')->down();
     }
 
     /**
···
      */
     public function down()
     {
-        (new CreateBeatmapsetDiscussions())->up();
+        migration('2016_02_29_052133_create_beatmapset_discussions')->up();
     }
 }

database/migrations/2017_11_22_081837_remove_kudosu_refresh_votes_from_beatmap_discussions.php

···
      */
     public function up()
     {
-        (new AddKudosuRefreshVotesToBeatmapDiscussions())->down();
+        migration('2016_12_19_132350_add_kudosu_refresh_votes_to_beatmap_discussions')->down();
     }
 
     /**
···
      */
     public function down()
     {
-        (new AddKudosuRefreshVotesToBeatmapDiscussions())->up();
+        migration('2016_12_19_132350_add_kudosu_refresh_votes_to_beatmap_discussions')->up();
     }
 }

database/migrations/2021_09_15_065842_create_new_score_tables.php

···
     {
         Schema::dropIfExists('solo_scores_process_history');
         Schema::dropIfExists('solo_scores');
-        (new CreateSoloScores())->up();
+        migration('2021_03_24_130818_create_solo_scores')->up();
     }
 }