GH-140061: Use _PyObject_IsUniquelyReferenced to check if object is uniquely referenced#140062

colesbury merged 13 commits into

python:mainpython/cpython:mainfrom

sergey-miryanov:140061-fix-checking-object-uniq-refsergey-miryanov/cpython:140061-fix-checking-object-uniq-refCopy head branch name to clipboard