Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Remove	@mark.nelson	Username is not present in either team or contributor whitelist.
Add	@wyatt.fry	User added from team charter mission team manifest
Add	@jimmy.bourque	User added from team charter mission team manifest
Add	@lgomez2	User added from team charter mission team manifest
Add	@kipten	User added from team charter mission team manifest
Add	@stephen.galamb	User added from team charter mission team manifest

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.