[ci] Drop support for Ubuntu 20.04 #3737
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Why this should be merged
Ubuntu 20.04 is in the process of being deprecated for github actions and will be fully unsupported by 2025-04-01. As per the linked issue, there are multiple 'brownout' periods scheduled in March during which any jobs using 20.04 runners will fail:
Removing the use of 20.04 in advance of those brownout dates will avoid CI disruption.
How this works
How this was tested
Need to be documented in RELEASES.md?
With the removal of support for Ubuntu 20.04 by Github Actions, our CI provider, we are no longer able to test against this release of Ubuntu. Please update to a newer Ubuntu version - we test against 22.04 and 24.04.