[10.x] Uses PHP Native Type Declarations 🐘 (#6010)

* Adds basic typing around method's arguments and return types

* Adds missing `closure` type

* Adds typing on tests

* Fixes `RedirectIfAuthenticated`

* Fixes `Authenticate`

* Improves `RedirectIfAuthenticated` types

* Fixes user factory `unverified` return type

database/migrations/2014_10_12_000000_create_users_table.php

@@ -8,10 +8,8 @@ return new class extends Migration
 {
     /**
      * Run the migrations.
-     *
-     * @return void
      */
-    public function up()
+    public function up(): void
     {
         Schema::create('users', function (Blueprint $table) {
             $table->id();
@@ -26,10 +24,8 @@ return new class extends Migration
 
     /**
      * Reverse the migrations.
-     *
-     * @return void
      */
-    public function down()
+    public function down(): void
     {
         Schema::dropIfExists('users');
     }