[ruby] Show error when Ruby 2.5.x detected

[styfle]

This will show a better error message when Ruby 2.5.x is detected and explain how to upgrade.

[codecov]

Codecov Report

Merging #7126 (ddfe596) into main (5efd3b9) will not change coverage.
The diff coverage is n/a.

❗ Current head ddfe596 differs from pull request most recent head 2f18522. Consider uploading reports for the commit 2f18522 to get more accurate results

@@           Coverage Diff           @@
##             main    #7126   +/-   ##
=======================================
  Coverage   51.49%   51.49%           
=======================================
  Files         128      128           
  Lines        4979     4979           
  Branches     1212     1212           
=======================================
  Hits         2564     2564           
  Misses       2403     2403           
  Partials       12       12           

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