chore: sync annotations between stubs

Author: SamMousa

stubs/ReflectionClassWithLazyObjects.stub

@@ -114,6 +114,7 @@ class ReflectionClass
 	/**
 	 * @phpstan-assert-if-true class-string<\UnitEnum> $this->name
 	 * @phpstan-assert-if-true class-string<\UnitEnum> $this->getName()
+	 * @phpstan-assert-if-true ReflectionClass<UnitEnum> $this
 	 * @return (T is \UnitEnum ? true: false)
 	 */
 	public function isEnum(): bool

tests/PHPStan/Analyser/nsrt/reflectionclass-isEnum.php

@@ -14,6 +14,8 @@ function testNarrowClassAfterIsEnum(string $class): void {
 		assertType('class-string<UnitEnum>', $r->name);
 		assertType('class-string<UnitEnum>', $r->getName());
 
+		assertType('UnitEnum', $r->newInstance());
+
 
 		// Todo:
 		//assertType('ReflectionClass<UnitEnum>', $r);