Python 3.11 support

[tony]

Including a minor refactor to URL.rule_map

[codecov]

Codecov Report

Merging #433 (c828db4) into master (e311976) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #433      +/-   ##
==========================================
- Coverage   62.35%   62.32%   -0.03%     
==========================================
  Files          39       39              
  Lines        3376     3376              
  Branches      833      924      +91     
==========================================
- Hits         2105     2104       -1     
  Misses        754      754              
- Partials      517      518       +1     

Impacted Files	Coverage Δ
src/libvcs/url/base.py	84.61% <ø> (ø)
src/libvcs/url/git.py	98.70% <100.00%> (-1.30%)	⬇️
src/libvcs/url/hg.py	94.93% <100.00%> (ø)
src/libvcs/url/svn.py	97.18% <100.00%> (ø)
tests/url/test_git.py	100.00% <100.00%> (ø)
tests/url/test_hg.py	100.00% <100.00%> (ø)
tests/url/test_svn.py	100.00% <100.00%> (ø)

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