Symfony version(s) affected: 5.0.4

Description
If a @method annotation with static return type is present on an interface, the DebugClassLoader reports Class Foo should implement method static FooInterface::method().

As per phpDocumentor method tag if a method is static the return type is mandatory. This implies that

 * @method static getInstance()

should be parsed as non-static method with static return type, but now is parsed as static untyped method.

Possible Solution
The @method parse regex on DebugClassLoader.php:L430 should capture return type and check it while determining if a method should be static or not.