Test with Ruby 3.1

[etagwerker]

Hey,

This PR tests the library with Ruby 3.1.

Please check it out.

Thanks!

I will abide by the code of conduct.

[codecov[bot]]

Codecov Report

Merging #85 (d599753) into main (66a1167) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #85   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          25       25           
  Lines         462      462           
=======================================
  Hits          454      454           
  Misses          8        8           

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[kindoflew]

Looks good to me! and I guess GitHub Actions did QA for us? haha