Upgrade ruby version for Github Action #74
Merged
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Cause:
With ruby 3.1 there was outdated rubygems included which with never version of psych gem version was failing to install one of the gems.
https://github.com/easolhq/easol-canvas/actions/runs/11702680056 openstreetmap/openstreetmap-website#4364
Solution:
One of the way to fix that problem was to update in Github action rubygems, but I opted in for upgrading Ruby version itself which already comes with proper version of rubygems and is already used in main Easol app.
Also upgraded Rubocop's ruby target version to match Ruby version.