Fix GUSINFO metadata in CODEOWNERS (#2059)

Since the Languages team was renamed to `Heroku - Languages` in GUS
some time ago.

GUS-W-21708465.

Author: edmorley

.github/CODEOWNERS

@@ -1,6 +1,6 @@
 # Default to requesting pull request reviews from the Heroku Languages team.
 #ECCN:Open Source
-#GUSINFO:Languages,Heroku Python Platform
+#GUSINFO:Heroku - Languages,Heroku Python Platform
 * @heroku/languages
 
 # However, request review from the language owner instead for files that are updated