Skip test on PHP < 8.2

Author: sebastianbergmann

tests/unit/Framework/MockObject/GeneratorTest.php

@@ -326,6 +326,9 @@ public function testCannotMockFinalClass(): void
         $this->createMock(FinalClass::class);
     }
 
+    /**
+     * @requires PHP 8.2
+     */
     public function testCannotMockReadonlyClass(): void
     {
         $this->expectException(ClassIsReadonlyException::class);