chore(codeowners): Replace team-fm-foundations with team-foundation in CODEOWNERS (#601)

Replace `@launchdarkly/team-fm-foundations` with
`@launchdarkly/team-foundation` in CODEOWNERS to reflect the team
rename.

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: devin-ai-integration[bot]

CODEOWNERS

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