📈 Update dependencies in CONTRIBUTING.md

[landongrindheim]

I'm updating the contributing docs to reflect our current dependencies.

• We switched to OpenSearch in 2023.
• We have Rubygems 3.6.X available, which should be used

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.22%. Comparing base (710cb8f) to head (f05db01).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5970   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files         473      473           
  Lines        9764     9764           
=======================================
  Hits         9493     9493           
  Misses        271      271           

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[colby-swandale]

🙌🏻