fix(deps): update greenlet for Python 3.14

[hadrien]

Problem

• uv.lock pins greenlet 3.1.1 without a CPython 3.14 wheel.
• Python 3.14 installations fall back to an incompatible source build.

Solution

• Lock greenlet 3.5.4 with CPython 3.14 wheels.
• Preserve all direct dependency constraints.
• Verify all extras, Ruff, and 26 tests on Python 3.14.

fs-3yg

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.39%. Comparing base (7414aec) to head (e5a55ab).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files           1        1           
  Lines         115      115           
  Branches        2        2           
=======================================
  Hits          112      112           
  Misses          3        3           

Flag	Coverage Δ
fastapi-post121	97.39% <ø> (ø)
fastapi-pre121	97.39% <ø> (ø)
sqlmodel	97.39% <ø> (ø)

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