python39: updated to 3.9.1

Python 3.9.1 final

Core and Builtins

bpo-42576: types.GenericAlias will now raise a TypeError when attempting to initialize with a keyword argument. Previously, this would cause the interpreter to crash if the interpreter was compiled with debug symbols. This does not affect interpreters compiled for release. Patch by Ken Jin.

Library

bpo-5054: CGIHTTPRequestHandler.run_cgi() HTTP_ACCEPT improperly parsed. Replace the special purpose getallmatchingheaders with generic get_all method and add relevant tests.
bpo-17735: inspect.findsource() now raises OSError instead of IndexError when co_lineno of a code object is greater than the file length. This can happen, for example, when a file is edited after it was imported.
bpo-42116: Fix handling of trailing comments by inspect.getsource().
bpo-42487: ChainMap.__iter__ no longer calls __getitem__ on underlying maps
bpo-42482: TracebackException no longer holds a reference to the exception窶冱 traceback object. Consequently, instances of TracebackException for equivalent but non-equal exceptions now compare as equal.
bpo-42406: We fixed an issue in pickle.whichmodule in which importing multiprocessing could change the how pickle identifies which module an object belongs to, potentially breaking the unpickling of those objects.
bpo-34215: Clarify the error message for asyncio.IncompleteReadError when expected is None.
bpo-12800: Extracting a symlink from a tarball should succeed and overwrite the symlink if it already exists. The fix is to remove the existing file or symlink before extraction. Based on patch by Chris AtLee, Jeffrey Kintscher, and Senthil Kumaran.

Tests

bpo-41473: Reenable test_gdb on gdb 9.2 and newer: https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb 10.1.
bpo-42553: Fix test_asyncio.test_call_later() race condition: don窶冲 measure asyncio performance in the call_later() unit test. The test failed randomly on the CI.

macOS

bpo-41116: If no explicit macOS SDK was specified, setup.py should check for Tcl and TK frameworks in /Library/Frameworks; the previous commit inadvertently broke that test.
bpo-42504: Fix build on macOS Big Sur when MACOSX_DEPLOYMENT_TARGET=11

IDLE

bpo-42508: Keep IDLE running on macOS. Remove obsolete workaround that prevented running files with shortcuts when using new universal2 installers built on macOS 11.

(adam)