(cherry picked from commit12f1c72)Co-authored-by: Steve Dower <steve.dower@python.org>

* master: (599 commits)  Docs: Improved phrasing (pythonGH-14069)  Remove redundant if check from optional argument function in argparse. (pythonGH-8766)  bpo-37289: Add a test for if with ifexpr in the peephole optimiser to detect regressions (pythonGH-14127)  Update What's New in Python 3.9 (pythonGH-14253)  bpo-36511: Improve ARM32 buildbot scripts (pythonGH-14251)  bpo-37151: remove _PyCFunction_FastCallDict (pythonGH-14269)  Fix typo, 'widger' -> 'widget', in idlelib/tree.py (pythonGH-14263)  Fix bpo number in News file. (pythonGH-14260)  bpo-37342: Fix the incorrect nb_index's type in typeobj documentation (pythonGH-14241)  Update What's New in Python 3.8 (pythonGH-14239)  bpo-36710: Use tstate in pylifecycle.c (pythonGH-14249)  Add missing single quote in io.TextIOWrapper.reconfigure documentation (pythonGH-14246)  bpo-36511: Add buildbot scripts and fix tests for Windows ARM32 buildbot (pythonGH-13454)  bpo-37333: Ensure IncludeTkinter has a value (pythonGH-14240)  bpo-37331: Clarify format of socket handler messages in the documentation. (pythonGH-14234)  bpo-37258: Not a bug, but added a unit test and updated documentation. (pythonGH-14229)  bpo-36710: Remove PyImport_Cleanup() function (pythonGH-14221)  Fix name of '\0'. (pythonGH-14222)  bpo-36710: Add tstate parameter in import.c (pythonGH-14218)  Document typing.ForwardRef (pythonGH-14216)  ...