treewide: fix broken `meta` attributes

pkgs/applications/misc/keepass-plugins/otpkeyprov/default.nix

···
       homepage    = "https://keepass.info/plugins.html#otpkeyprov";
       platforms   = with lib.platforms; linux;
       license     = lib.licenses.gpl2;
-      maintainers = [ lib.maintainers.ente ];
+      maintainers = [ lib.maintainers.Enteee ];
     };
 
     pluginFilename = "OtpKeyProv.plgx";

pkgs/games/quake3/quake3e/default.nix

···
     license = licenses.gpl2;
     platforms = platforms.linux;
     maintainers = with maintainers; [ pmiddend ];
-    badPlatforms = [ platforms.aarch64 ];
+    badPlatforms = platforms.aarch64;
     # never built on aarch64-linux since first introduction in nixpkgs
     broken = stdenv.isLinux && stdenv.isAarch64;
   };

pkgs/os-specific/linux/kernel/linux-rpi.nix

···
   '';
 
   extraMeta = if (rpiVersion < 3) then {
-    platforms = with lib.platforms; [ arm ];
+    platforms = with lib.platforms; arm;
     hydraPlatforms = [];
   } else {
-    platforms = with lib.platforms; [ arm aarch64 ];
+    platforms = with lib.platforms; arm ++ aarch64;
     hydraPlatforms = [ "aarch64-linux" ];
   };
 } // (args.argsOverride or {}))) (oldAttrs: {

pkgs/tools/security/onlykey-agent/default.nix

···
     meta = oa.meta // {
       description = "Using OnlyKey as hardware SSH and GPG agent";
       homepage = "https://github.com/trustcrypto/onlykey-agent/tree/ledger";
-      maintainers = with maintainers; [ kalbasit ];
+      maintainers = with lib.maintainers; [ kalbasit ];
     };
   });
 in