Fix code owners entries for protect -> govern
What does this MR do?
As part of renaming protect to govern, the mention groups used in CODEOWNERS
have to be updated.
Related to https://gitlab.com/gitlab-org/govern/general/-/issues/759#groupproject-moves
What are the relevant issue numbers?
Checklist
-
Ensure changes can be built upon without requiring a breaking change, see Building for Extensibility. -
Review and add/update tests for this feature/bug. -
Add an entry to the CHANGELOG if required, with the appropriate version. See Classifying Changes. -
Assign the MR to the appropriate person/people for review.