[CI] Add Ubuntu 26.04 runners to the CI workflow

[dbarker]

The Ubuntu 26.04 runners are available and can be added to the GitHub Action workflows.

https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2604-Readme.md
https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2604-Arm64-Readme.md

[marcalff]

And Ubuntu 22 is deprecated, to be decommissioned.

actions/runner-images#14254

[thompson-tomo]

This update will be automatically raised by renovate for all cases except if the runner image is defined in a matrix.