chore: update CODEOWNERS (#591)

Updating CODEOWNERS since I think we forgot to after the hand-off!

Author: cspath1

CODEOWNERS

@@ -1,12 +1,12 @@
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners
 
-* @launchdarkly/team-fm-govern
+* @launchdarkly/team-fm-next
 
 # Documentation
 *.md @launchdarkly/team-docs
 
 # vendor docs don't need to be owned by docs team
-vendor/ @launchdarkly/team-fm-govern
+vendor/ @launchdarkly/team-fm-next
 
 # Change log is updated by release bot
-CHANGELOG.md @launchdarkly/team-fm-govern
+CHANGELOG.md @launchdarkly/team-fm-next