Update Gitlab Runner images

[jakebman]

Description

Github deprecated and will remove two runner images.

macos-10.15 will be removed on 2022-08-30
macos-12 is available
https://github.blog/changelog/2022-07-20-github-actions-the-macos-10-15-actions-runner-image-is-being-deprecated-and-will-be-removed-by-8-30-22/

ubuntu-18.04 will be removed on 2022-12-01
ubuntu-22.04 is available
https://github.blog/changelog/2022-08-09-github-actions-the-ubuntu-18-04-actions-runner-image-is-being-deprecated-and-will-be-removed-by-12-1-22/

Motivation and Context

I found this detail while investigating intermittent macos test failures. This doesn't appear to be the cause of my issues, but it seems important information to share.

How Has This Been Tested?

This configuration successfully built on my fork's CI:
https://github.com/jakebman/bash-it/actions/runs/2848395734

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• I have added tests to cover my changes, and all the new and existing tests pass.

[tbhaxor]

LGTM. @NoahGorny Look the error on macOS is fixed 😄

[tbhaxor]

@NoahGorny @gaelicWizard Please remove the macos-10.15 and ubuntu-18.04 from the branch protection.

[cornfeedhobo]

@NoahGorny @davidpfarrell This PR gets my sign off. Considering that everything is building fine, I think it should be fine to bypass the current restriction and merge.

[NoahGorny]

Thanks @jakebman and thanks @tbhaxor @cornfeedhobo for the review