[9.x] Set anonymous migration (#37352)

* Set anonymous migration

* Set anonymous migration

* Set anonymous migration

Author: lloricode

src/Illuminate/Database/Migrations/stubs/migration.create.stub

@@ -4,7 +4,7 @@ use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
 
-class {{ class }} extends Migration
+return new class extends Migration
 {
     /**
      * Run the migrations.
@@ -28,4 +28,4 @@ class {{ class }} extends Migration
     {
         Schema::dropIfExists('{{ table }}');
     }
-}
+};

src/Illuminate/Database/Migrations/stubs/migration.stub

@@ -4,7 +4,7 @@ use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
 
-class {{ class }} extends Migration
+return new class extends Migration
 {
     /**
      * Run the migrations.
@@ -25,4 +25,4 @@ class {{ class }} extends Migration
     {
         //
     }
-}
+};

src/Illuminate/Database/Migrations/stubs/migration.update.stub

@@ -4,7 +4,7 @@ use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
 
-class {{ class }} extends Migration
+return new class extends Migration
 {
     /**
      * Run the migrations.
@@ -29,4 +29,4 @@ class {{ class }} extends Migration
             //
         });
     }
-}
+};