[major, fix] workflows: bump actions version and remove unsupported runner 18.04 #5381
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Description
Recently on April 1st, Ubuntu 18.04 runners reached the unsupported state and will no longer be available in actions (More information here: actions/runner-images#6002). This PR is not only for updating the runners but also for updating the related actions. I tested these changes before creating this PR in my fork's actions here https://github.com/kbdharun/flatpak/actions. Since this is a major change a thorough review is required.
Changes
Note: This check is being skipped in all my workflow runs, Update: I found out it is disabled since 8daa975]