Fix failing Clang builds on GitHub Actions #17
                
     Merged
            
            
          
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A while ago the
ubuntu-latestimage moved from Ubuntu 22.04 to Ubuntu 24.04. See actions/runner-images#10636. However, Ubuntu 24.04 does not have packages for Clang 11 and 12 anymore, thus the Clang jobs fail when they try to install the corresponding compilers. (See https://github.com/martinmoene/any-lite/actions/runs/13042535304/job/36387278327 for one such failed build.) Therefore, the workflow is changed to useubuntu-22.04instead ofubuntu-latest.Furthermore, a job for Clang 19 (latest Clang version available on Ubuntu 24.04) is added to run tests with a newer version, too.
(This is basically the same pull request as nonstd-lite/expected-lite#79 and nonstd-lite/variant-lite#52, but for any-lite.)