Upgrade specified Git version to 2.30.2

What does this MR do?

Upgrades git to the newest release.

Why was this MR needed?

The version we were using was vulnerable to a security issue on Windows.

What's the best way to test this MR?

Testing instructions given here : !2825 (comment 614354284)

Configurations used

config.toml

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "windows-docker-1809"
  url = "https://gitlab.com/"
  token = "TOKEN_HERE"
  executor = "docker-windows"
  pre_clone_script = "git version"
  [runners.docker]
    image = "mcr.microsoft.com/windows/servercore:1809_amd64"
    helper_image = "registry.gitlab.com/gitlab-org/gitlab-runner/gitlab-runner-helper:x86_64-6bd99b9d-servercore1809"
    pull_policy = ["if-not-present"]
    volumes = ["c:\\cache"]

.gitlab-ci.yml

variables:
  DURATION: 20

job:
  script:
  - Write-Output $PSVersionTable
  - for ($i = 1 ; $i -le $DURATION ; $i++){ Get-Date; Start-Sleep -s 1; Write-Output "================================="; }

Testing results

• Job log : the git version is well set to git version 2.30.2.windows.1 for windows 1809 as result of the pre_clone_script = "git version".

Screenshot

What are the relevant issue numbers?

closes #27674