fix gcc 15

[tlambert03]

fixes #43 and parametrizes the dockerfile to test both gcc 14 and 15

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.03%. Comparing base (9b93477) to head (c476531).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #44   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files          12       12           
  Lines         383      383           
=======================================
  Hits          364      364           
  Misses         19       19           

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[codspeed-hq]

CodSpeed Performance Report

Merging #44 will not alter performance

_{Comparing tlambert03:fix-gcc (c476531) with main (9b93477)}

Summary

✅ 6 untouched benchmarks

[tlambert03]

Jans rewrite of the rtree to use nanobind will supersede this. But for now this fixes gcc 15