cpython

gh-143637: Fix re-entrant mutation of ancillary data in socket.sendmsg() (#143892)

gh-144706: Warn against using synchronization primitives within signal handlers (GH-144736)

gh-143916: Allow HTAB in wsgiref header values

gh-135906: Test more internal headers in test_cext/test_cppext (#144751)

gh-80667: Fix case-sensitivity of some Unicode literal escapes (GH-107281)