* origin/master: (27 commits)
  bpo-41428: Fix compiler warnings in unionobject.c (GH-22388)
  bpo-41654: Fix compiler warning in MemoryError_dealloc() (GH-22387)
  bpo-41833: threading.Thread now uses the target name (GH-22357)
  bpo-30155: Add macros to get tzinfo from datetime instances (GH-21633)
  bpo-33822: Update IDLE section of What's New 3.8 (GH-22383)
  bpo-41844: Add IDLE section to What's New 3.9 (GN-22382)
  bpo-41841: Prepare IDLE News for 3.10 (GH-22379)
  bpo-37779 : Add information about the overriding behavior of ConfigParser.read (GH-15177)
  bpo-40170: Use inline _PyType_HasFeature() function (GH-22375)
  bpo-40941: Fix stackdepth compiler warnings (GH-22377)
  bpo-40941: Fix fold_tuple_on_constants() compiler warnings (GH-22378)
  bpo-40521: Fix PyUnicode_InternInPlace() (GH-22376)
  bpo-41834: Remove _Py_CheckRecursionLimit variable (GH-22359)
  bpo-1635741, unicodedata: add ucd_type parameter to UCD_Check() macro (GH-22328)
  bpo-1635741: Port _lsprof extension to multi-phase init (PEP 489) (GH-22220)
  bpo-41513: Improve order of adding fractional values. Improve variable names. (GH-22368)
  bpo-41816: `StrEnum.__str__` is `str.__str__` (GH-22362)
  bpo-35764: Rewrite the IDLE Calltips doc section  (GH-22363)
  bpo-41810: Reintroduce `types.EllipsisType`, `.NoneType` & `.NotImplementedType` (GH-22336)
  bpo-41602: raise SIGINT exit code on KeyboardInterrupt from pymain_run_module (#21956)
  ...