Update mikefarah/yq to 4.28.1

The following dependencies have been updated by deps:

• mikefarah/yq from 4.27.5 to 4.28.1

Update mikefarah/yq to 4.28.1

- Bump yq version from 4.27.5 to 4.28.1
- Add detection for changes in ci_files/variables.yml