Fix use of depreacted eckit API

[Ozaq]

Description

Fix use of depreacted eckit 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

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 51.07%. Comparing base (cced373) to head (69a8928).

Files with missing lines	Patch %	Lines
src/fckit/Log.cc	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #85   +/-   ##
========================================
  Coverage    51.07%   51.07%           
========================================
  Files           58       58           
  Lines         4854     4854           
  Branches       453      453           
========================================
  Hits          2479     2479           
  Misses        2375     2375           

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[Ozaq]

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