ci: Remove explicit macos image requirement

Jakub Jelenrequested to merge
macos-15 into master

The gitlab removed macos 14 which resulted in failures. Instead of updating and manually tracking specific macos version, we can leave the tag out to keep up using the latest version.

https://docs.gitlab.com/ci/runners/hosted_runners/macos/#supported-macos-images

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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