Improve our test workflow

[etagwerker]

• Add an entry to CHANGELOG.md that links to this PR under the "main (unreleased)" heading.

Description:

I noticed the test suite is failing for Ruby 2.6 and I wanted to fix it.

Closes #28

✅ I will abide by the code of conduct.

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.28%. Comparing base (3a87be4) to head (d0dc780).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
+ Coverage   83.20%   83.28%   +0.08%     
==========================================
  Files          19       19              
  Lines         750      760      +10     
==========================================
+ Hits          624      633       +9     
- Misses        126      127       +1     

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