* update gitlab label's color
fail if both new_name and color are missing, as per Gitlab API docs.
* add changelog
* Update changelog with suggestion
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
* remove unneeded check
* Update changelog
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Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>