Remove ruamel-yaml as a dependency

[bachya]

Describe what the PR does:

Turns out, we don't need it.

Does this fix a specific issue?

N/A

Checklist:

• Confirm that one or more new tests are written for the new functionality.
• Run tests and ensure everything passes (with 100% test coverage).
• Update README.md with any new documentation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (501f2f5) 100.00% compared to head (31b813f) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev      #246   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          235       235           
=========================================
  Hits           235       235           

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