Reduce CI test matrix to save on Actions minutes

.github/workflows/code-style.yml

···
 
       - name: Run PHP CS Fixer
         run: php-cs-fixer fix --dry-run --diff --verbose
-        continue-on-error: true

.github/workflows/tests.yml

···
   test:
     runs-on: ubuntu-latest
 
-    strategy:
-      fail-fast: false
-      matrix:
-        php: [8.2, 8.3, 8.4]
-        laravel: [11.*, 12.*]
-        dependency-version: [prefer-stable]
-        include:
-          - laravel: 11.*
-            testbench: 9.*
-          - laravel: 12.*
-            testbench: 10.*
-
-    name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }}
+    name: Tests (PHP 8.2 - Laravel 12)
 
     steps:
       - name: Checkout code
···
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: ${{ matrix.php }}
+          php-version: 8.2
           extensions: gmp, mbstring, json
           coverage: none
 
       - name: Install dependencies
         run: |
-          composer require "laravel/framework:${{ matrix.laravel }}" "orchestra/testbench:${{ matrix.testbench }}" --no-interaction --no-update
-          composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction
+          composer require "laravel/framework:^12.0" "orchestra/testbench:^10.0" --no-interaction --no-update
+          composer update --prefer-stable --prefer-dist --no-interaction
 
       - name: Execute tests
         run: vendor/bin/phpunit