Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Remove	@montgomery.marcus	Employment dates no longer active
Remove	@lgomez2	User not listed in team charter mission team manifest for this repository
Remove	@kipten	User not listed in team charter mission team manifest for this repository
Remove	@cwilliams68067	User not listed in team charter mission team manifest for this repository
Remove	@wyatt.fry	User not listed in team charter mission team manifest for this repository

These changes were automatically generated based on the state stored in the team charter mission team manifest. If these changes are not expected, please refer to updating team charter manifest.