GJ-62 Migrate pytests to new pyfdb API

[ChrisspyB]

Description

Due to breaking changes in the latest pyfdb API.

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 77.06%. Comparing base (4ba3682) to head (62aa73e).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #88      +/-   ##
===========================================
- Coverage    77.90%   77.06%   -0.84%     
===========================================
  Files           97       94       -3     
  Lines         4920     4740     -180     
  Branches       443      443              
===========================================
- Hits          3833     3653     -180     
  Misses        1087     1087              

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[ChrisspyB]

CI failures appear to be caching issues on the runners(?). Will merge to develop, and investigate these failures in a separate PR.

[Copilot]

Pull request overview

Updates the pygribjump pytest suite to accommodate breaking changes in the latest pyfdb Python API.

Changes:

• Adapt pyfdb.FDB.archive() test usage to the updated call signature (no key= keyword).
• Update pyfdb.FDB.list() test usage to iterate over returned elements and extract uri/offset via the new accessors.

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