Copy `code.co_qualname` on Python >= 3.11 As of the changes to `linecache` in https://github.com/python/cpython/issues/117174, logging tracebacks requires code objects to have a `co_qualname` attribute, which is true for native Python code objects as of 3.11. Adjust billiard's emulation of them to match.
Spotted by pagure's tests in https://bugs.debian.org/1101621; analysis and patch by Rebecca N. Palmer <rebecca_palmer@zoho.com>.
