gh-111789: Use PyDict_GetItemRef() in Python/codecs.c#112082

ambv merged 3 commits intopython:mainpython/cpython:mainfrom

serhiy-storchaka:use-dict_getitemref-Python/codecs.cserhiy-storchaka/cpython:use-dict_getitemref-Python/codecs.cCopy head branch name to clipboard