[Reflection] Update return types in some reflection methods #2694
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Please, confirm I should I also update the existing stubs.
IIUC, stubs from PHPStorm already declare the proper return types through attributes depending on the PHP version, but I guess they are not being parsed here.
See https://phpstan.org/r/85179264-493f-4b65-a8ff-4af5b45b31c1.