Constrain pyfdb to versions below 1.0

[andreas-grafberger]

Description

Because a major pyfdb release with breaking changes is coming soon, we are temporarily pinning pyfdb so that current earthkit-data usage continues to work without issues.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.98%. Comparing base (5a74caa) to head (499616d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #940   +/-   ##
========================================
  Coverage    84.98%   84.98%           
========================================
  Files          188      188           
  Lines        14230    14230           
  Branches       724      724           
========================================
  Hits         12093    12093           
  Misses        1925     1925           
  Partials       212      212           

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