chore(deps): update python docker tag to v3.15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
python (source)	final	minor	3.14-slim → 3.15-slim

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74%. Comparing base (65835e9) to head (8511f16).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff           @@
##           main   #1718     +/-   ##
======================================
+ Coverage    36%     74%    +37%     
======================================
  Files        32      36      +4     
  Lines      2562    4109   +1547     
======================================
+ Hits        943    3063   +2120     
+ Misses     1619    1046    -573     

Flag	Coverage Δ
examples	36% <ø> (ø)
tests	73% <ø> (?)

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