CI: Bump to PyPy3.10

[hugovk]

https://www.pypy.org/posts/2023/06/pypy-v7312-release.html

And update more config, see commit messages.

[codecov[bot]]

Codecov Report

Merging #257 (122981d) into main (f44a274) will decrease coverage by 0.62%. Report is 2 commits behind head on main. The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
- Coverage   94.83%   94.21%   -0.62%     
==========================================
  Files           5        5              
  Lines        2361     2387      +26     
==========================================
+ Hits         2239     2249      +10     
- Misses        122      138      +16     

Flag	Coverage Δ
macos-latest	94.17% <33.33%> (-0.62%)	:arrow_down:
ubuntu-latest	94.17% <33.33%> (-0.62%)	:arrow_down:
windows-latest	94.13% <33.33%> (-0.62%)	:arrow_down:

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Files Changed	Coverage Δ
src/prettytable/prettytable.py	90.36% <28.57%> (-0.96%)	:arrow_down:
tests/test_prettytable.py	100.00% <100.00%> (ø)

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