fix: Fortran pkg-config file

[LecrisUT]

Found this when working on an old debian container. Apparently depends is not the correct syntax it should be Requires. Surprised these were not picked up by the tmt tests

[LecrisUT]

I will write proper tests for this when I address #363

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b02dedb) 83.80% compared to head (2a1798a) 83.80%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #357   +/-   ##
========================================
  Coverage    83.80%   83.80%           
========================================
  Files           24       24           
  Lines         8167     8167           
========================================
  Hits          6844     6844           
  Misses        1323     1323           

Flag	Coverage Δ
c_api	77.18% <ø> (ø)
fortran_api	56.19% <ø> (ø)
python_api	80.47% <ø> (ø)
unit_tests	1.24% <ø> (ø)

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