fix error on clone $enum

Author: marc-mabe

src/Enum.php

@@ -81,7 +81,7 @@ public function __toString(): string
      * @throws LogicException Enums are not cloneable
      *                        because instances are implemented as singletons
      */
-    final protected function __clone()
+    final public function __clone()
     {
         throw new LogicException('Enums are not cloneable');
     }

tests/MabeEnumTest/EnumTest.php

@@ -355,12 +355,10 @@ public function testCloneNotCallableAndThrowsLogicException(): void
 
         $reflectionClass  = new ReflectionClass($enum);
         $reflectionMethod = $reflectionClass->getMethod('__clone');
-        $this->assertTrue($reflectionMethod->isProtected(), 'The method __clone must be protected');
         $this->assertTrue($reflectionMethod->isFinal(), 'The method __clone must be final');
 
-        $reflectionMethod->setAccessible(true);
         $this->expectException(LogicException::class);
-        $reflectionMethod->invoke($enum);
+        clone $enum;
     }
 
     public function testNotSerializable(): void