Merge branch 'revert-cdf97e7c' into 'master'

Revert "Merge branch '5500-pg11-deprecation-warning' into 'master'"

See merge request gitlab-org/gitlab!48564

doc/install/requirements.md

@@ -154,7 +154,6 @@ GitLab version | Minimum PostgreSQL version
 -|-
 10.0 | 9.6
 13.0 | 11
-13.6 | 12
 
 You must also ensure the `pg_trgm` and `btree_gist` extensions are [loaded into every
 GitLab database](postgresql_extensions.html).