fix!: bump httpx-ws >= 0.7.1 to fix frankie567/httpx-ws#29

[WSH032]

Drop Python 3.8 support. Add support for Python 3.13. It's because httpx-ws >= 0.7 not longer supports Python 3.8.

BREAKING CHANGE: Drop Python 3.8 support.

Summary

Checklist

• I've read CONTRIBUTING.md.
• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.97%. Comparing base (558a86b) to head (9856a5d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.96%   96.97%   +0.01%     
==========================================
  Files           9        9              
  Lines         461      463       +2     
  Branches       44       35       -9     
==========================================
+ Hits          447      449       +2     
  Misses          9        9              
  Partials        5        5              

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