Fix using grid_spec in GRIB geography depending on eckit-geo

[sandorkertesz]

Description

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.
⚠️ Please upload report for BASE (release/0.19.0@3a22a57). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release/0.19.0     #888   +/-   ##
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  Coverage                  ?   85.31%           
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  Files                     ?      184           
  Lines                     ?    14463           
  Branches                  ?      718           
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  Hits                      ?    12339           
  Misses                    ?     1919           
  Partials                  ?      205           

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