CI: trust bundler: cache

[olleolleolle]

This PR uses the bundler-cache feature of the Ruby-maintained Action ruby/setup-ruby.

See ruby/setup-ruby parameters declaration for more information.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (138bfa6) to head (3e7847e).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #254   +/-   ##
=======================================
  Coverage   99.47%   99.47%           
=======================================
  Files          29       29           
  Lines         766      766           
=======================================
  Hits          762      762           
  Misses          4        4           

Flag	Coverage Δ
unittests	99.47% <ø> (ø)

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[adomokos]

Thank you! 💯