[python] pyfdb and z3fdb version fix

[tmi]

fixing the missing .

simplifying the IS_LOCAL_BUILD, no need to explicate

🌈🌦️📖🚧 Documentation FDB 🚧📖🌦️🌈
https://sites.ecmwf.int/docs/dev-section/fdb/pull-requests/PR-248

[tmi]

test pypi publish https://github.com/ecmwf/python-develop-bundle/actions/runs/22993869133

seems correct: $ uv pip install --prerelease=allow -i https://test.pypi.org/simple/ z3fdb==5.20.2.dev58 installs

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.18%. Comparing base (34eec13) to head (63aa08f).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #248      +/-   ##
===========================================
- Coverage    71.19%   71.18%   -0.01%     
===========================================
  Files          376      376              
  Lines        23762    23762              
  Branches      2478     2476       -2     
===========================================
- Hits         16918    16916       -2     
- Misses        6844     6846       +2     

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