Bundled asyncore.py for Python 3.12+

[yuce]

Copied asyncore.py from Python 3.11.6 and removed the deprecation warning which causes that not to run on Python 3.12+. That's only change in that file.

[ihsandemir]

looks good until we switch to asyncio.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.49140% with 405 lines in your changes missing coverage. Please review.

Project coverage is 94.69%. Comparing base (dd6cd1c) to head (610d16e).
Report is 40 commits behind head on master.

Files with missing lines	Patch %	Lines
hazelcast/asyncore.py	0.00%	403 Missing ⚠️
hazelcast/reactor.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #649      +/-   ##
==========================================
- Coverage   96.51%   94.69%   -1.82%     
==========================================
  Files         358      359       +1     
  Lines       20962    21368     +406     
==========================================
+ Hits        20231    20235       +4     
- Misses        731     1133     +402     

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