system_check: Bump minimum required Git version to v2.33.0

Gitaly is about to bump the minimum required Git version to v2.33.0 to
make use of several features introduced since the current miminum
required version, which is v2.31.0. Adapt the system check to verify
we've got a recent-enough version of Git.

Changelog: changed

README.md

@@ -81,7 +81,7 @@ GitLab is a Ruby on Rails application that runs on the following software:
 - Ubuntu/Debian/CentOS/RHEL/OpenSUSE
 - Ruby (MRI) 2.7.4
-- Git 2.31+
+- Git 2.33+
 - Redis 5.0+
 - PostgreSQL 12+

doc/install/installation.md

@@ -51,7 +51,7 @@ If the highest number stable branch is unclear, check the [GitLab blog](https://
 | -------- | --------------- | ----- |
 | [Ruby](#2-ruby)     | `2.7`             | From GitLab 13.6, Ruby 2.7 is required. Ruby 3.0 is not supported yet (see [the relevant epic](https://gitlab.com/groups/gitlab-org/-/epics/5149) for the current status). You must use the standard MRI implementation of Ruby. We love [JRuby](https://www.jruby.org/) and [Rubinius](https://github.com/rubinius/rubinius#the-rubinius-language-platform), but GitLab needs several Gems that have native extensions. |
 | [Go](#3-go) | `1.15` | |
-| [Git](#git) | `2.31.x` | From GitLab 13.11, Git 2.31.x and later is required. It's highly recommended that you use the [Git version provided by Gitaly](#git). |
+| [Git](#git) | `2.33.x` | From GitLab 14.4, Git 2.33.x and later is required. It's highly recommended that you use the [Git version provided by Gitaly](#git). |
 | [Node.js](#4-node) | `12.22.1` | GitLab uses [webpack](https://webpack.js.org/) to compile frontend assets. Node.js 14.x is recommended, as it's faster. You can check which version you're running with `node -v`. You need to update it to a newer version if needed. |
 ## GitLab directory structure

doc/update/index.md

@@ -297,6 +297,11 @@ NOTE:
 Specific information that follow related to Ruby and Git versions do not apply to [Omnibus installations](https://docs.gitlab.com/omnibus/)
 and [Helm Chart deployments](https://docs.gitlab.com/charts/). They come with appropriate Ruby and Git versions and are not using system binaries for Ruby and Git. There is no need to install Ruby or Git when utilizing these two approaches.
+### 14.4.0
+
+Git 2.33.x and later is required. We recommend you use the
+[Git version provided by Gitaly](../install/installation.md#git).
+
 ### 14.3.0
 Ruby 2.7.4 is required. Refer to [the Ruby installation instructions](../install/installation.md#2-ruby)

lib/system_check/app/git_version_check.rb

@@ -7,7 +7,7 @@ class GitVersionCheck < SystemCheck::BaseCheck
       set_check_pass -> { "yes (#{self.current_version})" }
       def self.required_version
-        @required_version ||= Gitlab::VersionInfo.parse('2.31.0')
+        @required_version ||= Gitlab::VersionInfo.parse('2.33.0')
       end
       def self.current_version