ci: Actions updates

[k4black]

1. rename build -> reusable-build
2. 3.12 as default and fix compatibly issues
3. remove codecov toke
4. pip trusted publishing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ed9f0e4) 36.60% compared to head (b837441) 36.77%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   36.60%   36.77%   +0.17%     
==========================================
  Files          12       12              
  Lines        1642     1648       +6     
==========================================
+ Hits          601      606       +5     
- Misses       1041     1042       +1     

Flag	Coverage Δ
unittests	?

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Files	Coverage Δ
codebleu/bleu.py	60.50% <100.00%> (+2.09%)	⬆️

... and 1 file with indirect coverage changes

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