Add py3.14 to CI test matrix

[asvetlov]

It allows errors detection early.

[codspeed-hq]

CodSpeed Performance Report

Merging #10178 will not alter performance

_{Comparing py-3.14 (eaa78de) with master (e45c3b8)}

Summary

✅ 46 untouched benchmarks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.75%. Comparing base (e45c3b8) to head (eaa78de).
⚠️ Report is 1588 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10178   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files         122      122           
  Lines       37010    37010           
  Branches     4417     4417           
=======================================
  Hits        36551    36551           
  Misses        313      313           
  Partials      146      146           

Flag	Coverage Δ
CI-GHA	98.64% <ø> (ø)
OS-Linux	98.33% <ø> (ø)
OS-Windows	96.18% <ø> (ø)
OS-macOS	97.44% <ø> (ø)
Py-3.10.11	97.28% <ø> (-0.01%)	⬇️
Py-3.10.15	97.87% <ø> (+0.05%)	⬆️
Py-3.11.11	97.91% <ø> (+0.05%)	⬆️
Py-3.11.9	97.33% <ø> (+<0.01%)	⬆️
Py-3.12.8	98.38% <ø> (-0.01%)	⬇️
Py-3.13.1	98.37% <ø> (+0.04%)	⬆️
Py-3.9.13	97.20% <ø> (ø)
Py-3.9.20	97.74% <ø> (ø)
Py-pypy7.3.16	97.35% <ø> (ø)
VM-macos	97.44% <ø> (ø)
VM-ubuntu	98.33% <ø> (ø)
VM-windows	96.18% <ø> (ø)

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