Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Remove	@alieberman	Employment dates no longer active
Remove	@danilo-patrucco	User not listed in team charter mission team manifest for this repository
Remove	@jfoster	User not listed in team charter mission team manifest for this repository
Remove	@mgoloski	User not listed in team charter mission team manifest for this repository
Remove	@leedarrien	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.