[11.x] Allow BackedEnum and UnitEnum in Rule::in and Rule::notIn (#50680)

* add backedenum and unitenum

* Update In.php

* Update NotIn.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: PerryvanderMeer

src/Illuminate/Validation/Rules/In.php

@@ -26,7 +26,7 @@ class In implements Stringable
     /**
      * Create a new in rule instance.
      *
-     * @param  \Illuminate\Contracts\Support\Arrayable|array|string  $values
+     * @param  \Illuminate\Contracts\Support\Arrayable|\BackedEnum|\UnitEnum|array|string  $values
      * @return void
      */
     public function __construct($values)

src/Illuminate/Validation/Rules/NotIn.php

@@ -26,7 +26,7 @@ class NotIn implements Stringable
     /**
      * Create a new "not in" rule instance.
      *
-     * @param  \Illuminate\Contracts\Support\Arrayable|array|string  $values
+     * @param  \Illuminate\Contracts\Support\Arrayable|\BackedEnum|\UnitEnum|array|string  $values
      * @return void
      */
     public function __construct($values)