Summary

Theubuntu-20.04 GitHub Actions runner image, currentlyused in thetests.yml workflow will soon be unsupported, as notified at:actions/runner-images#11101

Proposed fix

Ubuntu 20.04 itself is a long-term-support release, however it is also nearing the end of that support cycle, and will no longer be supported by Canonical from May 2025:https://ubuntu.com/20-04

I'd suggest removing theubuntu-20.04 jobs from thetests.yml workflows at the end of this month (March 2025).