CODEOWNERS: kubernetes backend is maintained by tf-eco-hybrid-cloud

We're trying to standardize on using teams rather than individuals because
that way the membership will get managed automatically by other processes
rather than us having to maintain the sets directly in this file.

I asked internally and the answer was that this team best represents the
set of individuals who share responsibility for maintaining this backend.

CODEOWNERS

@@ -17,7 +17,7 @@
 #/internal/backend/remote-state/oss              @xiaozhu36
 #/internal/backend/remote-state/pg               @remilapeyre
 /internal/backend/remote-state/s3                @hashicorp/terraform-aws
-/internal/backend/remote-state/kubernetes        @jrhouston @alexsomesan
+/internal/backend/remote-state/kubernetes        @hashicorp/tf-eco-hybrid-cloud
 
 # Provisioners
 builtin/provisioners/file               @hashicorp/terraform-core