[CI] Fix installing apt dependencies by using action. #862
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This PR how CI installs dependencies via apt: the previous code simply ran apt-get install without prio apt-get update. This may make CI break, which happened for some PRs, if the GH runner has a version of a package in cache that just got updated such that the cached URL is invalid and the package cannot be installed. By using a proper GH action, not only is that taken care of but the package is even cached such that installing it may be a bit faster.