CI-unixish.yml: Use Qt version provided by the distro #3729
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Using a fixed Qt version is convenient in the CI but this is not possible for users of the distro we are testing on. We should use the provided one to make sure we can actually build on that platform (in case of ubuntu-18.04 it did not...well, technically it failed linking).
The install of Qt is also faster than
jurplel/install-qt-action@v2
(installing all software on ubuntu takes about 45s whereas Qt alone took 1m15s before) and will obviously be more stable as well.The remaining jobs which cannot do this will be updated to cache the Qt installation soon.