ReflectionProperty::setAccessible() and ReflectionMethod::setAccessible() should probably be deprecated

[yamut]

Description

According to php/doc-en#980 as of 8.1 these methods have no effect so it's just dead code for everyone on or after this version.

[DanielEScherzer]

Already proposed for 8.5 in https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_reflectionsetaccessible

[yamut]

Ah thanks, I missed that.