Bugfixes 🐛

• Fix endless recursion with nested traits via anonymous classes (#1303), #7214, thanks @herndlm!
• Support string accessory types in BitwiseNot (#1266), thanks @staabm!
• infer non-empty-string on substr() comparison with constant string (#1259), #6792, thanks @staabm!
• Fix invalidating conditional expressions after ArrayDimFetch unset (phpstan/phpstan-src@cc640d7)