Update more of the requirement docs

That were listing PG11

README.md

@@ -82,7 +82,7 @@ GitLab is a Ruby on Rails application that runs on the following software:
 - Ruby (MRI) 2.7.2
 - Git 2.31+
 - Redis 5.0+
-- PostgreSQL 11+
+- PostgreSQL 12+
 For more information please see the [architecture](https://docs.gitlab.com/ee/development/architecture.html) and [requirements](https://docs.gitlab.com/ee/install/requirements.html) documentation.

doc/install/installation.md

@@ -292,7 +292,7 @@ sudo adduser --disabled-login --gecos 'GitLab' git
 ## 6. Database
 NOTE:
-In GitLab 12.1 and later, only PostgreSQL is supported. In GitLab 13.0 and later, we [require PostgreSQL 11+](requirements.md#postgresql-requirements).
+In GitLab 12.1 and later, only PostgreSQL is supported. In GitLab 13.0 and later, we [require PostgreSQL 12+](requirements.md#postgresql-requirements).
 1. Install the database packages.

doc/update/upgrading_from_source.md

@@ -149,7 +149,7 @@ Remember to set `git -> bin_path` to `/usr/local/bin/git` in `config/gitlab.yml`
 ### 7. Update PostgreSQL
 WARNING:
-From GitLab 13.0, you must use at least PostgreSQL 11.
+From GitLab 14.0, you must use at least PostgreSQL 12.
 The latest version of GitLab might depend on a more recent PostgreSQL version
 than what you're currently running. You may also need to enable some