merge 3.3 (#22643)

diff --cc Lib/test/test_unicode.py
Simple merge

diff --cc Misc/NEWS
index fd8011e298060109adf8a2055cdee94fa82d4abc,7676c9051dd382a70cc2abb67769601ef6f582c5..4b4d89df83ba6c0dc920dd6ce078d7b587ab9eea
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -11,10 -10,10 +11,13 @@@ Release date: TB
  Core and Builtins
  -----------------
  
 -- Issue #22518: Fixed integer overflow issues in "backslashreplace",
+ - Issue #22643: Fix integer overflow in Unicode case operations (upper, lower,
+   title, swapcase, casefold).
+ 
 +- Issue #22604: Fix assertion error in debug mode when dividing a complex
 +  number by (nan+0j).
 +
 +- Issue #22470: Fixed integer overflow issues in "backslashreplace",
    "xmlcharrefreplace", and "surrogatepass" error handlers.
  
  - Issue #22520: Fix overflow checking when generating the repr of a unicode

diff --cc Objects/unicodeobject.c
Simple merge