Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Remove	@andrew.shoell	Username is not present in either team or contributor whitelist.
Remove	@akesterson	User not listed in team charter mission team manifest for this repository
Remove	@jimmy.bourque	User not listed in team charter mission team manifest for this repository
Remove	@jeffv	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.