Back to Ubuntu16 for cpython3.13, disable deadsnakes#314

sergey-dryabzhinsky wants to merge 7 commits intomastersergey-dryabzhinsky/python-zstd:masterfrom

issue-310-use-posix-sysconfsergey-dryabzhinsky/python-zstd:issue-310-use-posix-sysconfCopy head branch name to clipboard