Merge branch 'nhxnguyen-master-patch-81435' into 'master'

Add note about PG12 Geo support

See merge request gitlab-org/omnibus-gitlab!4508

doc/update/gitlab_13_changes.md

@@ -32,4 +32,5 @@ on how to upgrade the packaged PostgreSQL server to required version.
 PostgreSQL 12.3 is being shipped with the package in addition to 11.7 which is still the default version.
 Both fresh installs and upgrades will still continue to use 11.7, but users can manually upgrade to 12.3 following the
-[upgrade docs](../settings/database.md#upgrade-packaged-postgresql-server).
+[upgrade docs](../settings/database.md#upgrade-packaged-postgresql-server). Note that PostgreSQL 12 is not supported
+for Geo deployments in GitLab 13.3 and is planned for the 13.4 release.