Update minimal Ubuntu version in workflows from 20.04 to 22.04 #1670
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Ubuntu 20.04 LTS is reaching the end of its standard support period.
GitHub runners are going to stop providing images for it soon.
This PR updates all workflows to use 22.04 instead of 20.04.
While this will impact the compatibility of prebuilt release binaries on 20.04, users of those systems can always build Luau from source.
coverage
workflow is also updating from clang++10 to clang++ (defaults to clang++14 today).Line coverage with this switch drops from 89.65% to 87.45%, function coverage remains 91.26%.
As a bonus, we now get branch coverage information.