chore: Update GitHub Actions to use specific versions

[saraburns1]

Closes #15

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.19%. Comparing base (9a337cb) to head (196057b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   74.19%   74.19%           
=======================================
  Files           6        6           
  Lines          62       62           
  Branches       10       10           
=======================================
  Hits           46       46           
  Misses         16       16           

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