Migrations: Updated with type hints instead of php doc

Also updated code to properly import used facades.
For #4903

database/migrations/2014_10_12_000000_create_users_table.php

@@ -1,16 +1,17 @@
 <?php
 
+use Carbon\Carbon;
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
 
 return new class extends Migration
 {
     /**
      * Run the migrations.
-     *
-     * @return void
      */
-    public function up()
+    public function up(): void
     {
         Schema::create('users', function (Blueprint $table) {
             $table->increments('id');
@@ -26,17 +27,15 @@ return new class extends Migration
             'name'       => 'Admin',
             'email'      => 'admin@admin.com',
             'password'   => bcrypt('password'),
-            'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
-            'updated_at' => \Carbon\Carbon::now()->toDateTimeString(),
+            'created_at' => Carbon::now()->toDateTimeString(),
+            'updated_at' => Carbon::now()->toDateTimeString(),
         ]);
     }
 
     /**
      * Reverse the migrations.
-     *
-     * @return void
      */
-    public function down()
+    public function down(): void
     {
         Schema::drop('users');
     }