GitHub Actions: Ubuntu-latest workflows will use Ubuntu-22.04

Workflows using the ubuntu-latest runner label will soon run on Ubuntu-22.04.

Ubuntu 22.04 became generally available on GitHub-hosted runners in August 2022. Now Ubuntu-22.04 is ready to be the default version for the ubuntu-latest label in GitHub Actions workflows. This change will be rolled out over a period of 8 weeks beginning on October 1, 2022.

If you see any issues with your workflows when they are transitioned to Ubuntu-22.04:

• File an issue in the runner-images repository
• Switch back to Ubuntu 20.04 by specifying the ubuntu-20.04 runner label. We will continue to support Ubuntu 20.04.

Note that image software between Ubuntu-20.04 and Ubuntu-22.04 differs by the pre-installed and default versions versions of some tools. See the full list.