Chore/add py313 upgrade lxml

[chrisbc]

experimental update fro python3.13 support in nzshm-hazard-graphl-api

superceded by #148 which merges into the pre-release branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.64%. Comparing base (906a2d0) to head (8289b0b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   87.53%   87.64%   +0.10%     
==========================================
  Files          35       35              
  Lines        1717     1716       -1     
  Branches      216      216              
==========================================
+ Hits         1503     1504       +1     
+ Misses        173      171       -2     
  Partials       41       41              

Flag	Coverage Δ
unittests	87.64% <100.00%> (+0.10%)	⬆️

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