[PR #11643 backport][3.14] Move dependency metadata from setup.cfg to pyproject.toml

[cdce8p]

This is a backport of PR #11643 as merged into master (e1aec0a).

Modified the backport to include attrs again as present on the 3.14 branch.

[codspeed-hq]

CodSpeed Performance Report

Merging #11736 will not alter performance

_{Comparing cdce8p:move-dependencies-3.14 (9e01226) with 3.14 (9b8f4b9)}

Summary

✅ 59 untouched

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.20%. Comparing base (baf646f) to head (9e01226).
⚠️ Report is 128 commits behind head on 3.14.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.14   #11736   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files         128      128           
  Lines       44065    44065           
  Branches     2394     2394           
=======================================
  Hits        43274    43274           
  Misses        610      610           
  Partials      181      181           

Flag	Coverage Δ
CI-GHA	98.09% <ø> (ø)
OS-Linux	97.85% <ø> (+<0.01%)	⬆️
OS-Windows	95.55% <ø> (-0.01%)	⬇️
OS-macOS	97.09% <ø> (+<0.01%)	⬆️
Py-3.10.11	96.61% <ø> (+<0.01%)	⬆️
Py-3.10.18	97.12% <ø> (+<0.01%)	⬆️
Py-3.11.13	97.36% <ø> (ø)
Py-3.11.9	96.86% <ø> (ø)
Py-3.12.10	96.95% <ø> (ø)
Py-3.12.11	97.45% <ø> (-0.01%)	⬇️
Py-3.13.7	97.44% <ø> (ø)
Py-3.13.9	96.93% <ø> (ø)
Py-3.14.0	97.66% <ø> (-0.01%)	⬇️
Py-3.14.0t	96.75% <ø> (+<0.01%)	⬆️
Py-pypy3.10.16-7.3.19	84.32% <ø> (-7.52%)	⬇️
VM-macos	97.09% <ø> (+<0.01%)	⬆️
VM-ubuntu	97.85% <ø> (+<0.01%)	⬆️
VM-windows	95.55% <ø> (-0.01%)	⬇️

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