Issue #21634: Fix pystone micro-benchmark: use floor division instead of true
division to benchmark integers instead of floating point numbers. Set pystone
version to 1.2. Patch written by Lennart Regebro.
Issue #21636: Fix test_logging, skip UNIX stream (AF_UNIX) tests on Windows.
Patch written by Claudiu Popa.
Issue #6181: Fixed errors in tkinter.Listbox docstrings.
Based on patch by Guilherme Polo.
Issue #21623: open pyproject.props with an explicit encoding
Issue #6181: Fixed minor bugs in tkinter.Listbox methods:
bbox(), curselection() and get().
Issue #21639: Fix name of _testcapi test functions
Issue #21639: Add a test to check that PyMem_Malloc(0) with tracemalloc enabled
does not crash.
Issue #18492: Allow all resources when tests are not run by regrtest.py.

This changeset also includes cleanup allowed by this behavior change.
Issue #21601: Document asyncio.Task.cancel(). Initial patch written by Vajrasky
Kok.
Issue 21533: Dicts take iterables, not iterators. Patch by Wolfgang Maier.