[CI] windows-2016 to be removed from github actions

[ShootingKing-AM]

https://github.com/alliedmodders/amxmodx/blob/5dcda02b65b08f408f58b60453b8eff1b448ac33/.github/workflows/ci.yml#L37

On March 15, 2022,

Windows 2016 hosted runners will be removed from GitHub Actions. In preparation for the deprecation, there are two scheduled brownout periods for our team to perform maintenance: December 1, 2021: 4:00pm–10:00pm UTC February 7, 2022: 4:00pm–10:00pm UTC

Jobs that use Windows 2016 scheduled to run during this time will temporarily fail.

What you need to do

We recommend you change jobs using runs-on: windows-2016 to use runs-on: windows-latest which will ensure you're always running on the latest version of Windows Server.

https://github.blog/changelog/2021-10-19-github-actions-the-windows-2016-runner-image-will-be-removed-from-github-hosted-runners-on-march-15-2022/