Update stale.yml

[zFernand0]

What It Does

Adds the good first issue and priority medium to the list of exempt labels to the stale bot 😋

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.28%. Comparing base (f5c29c6) to head (979043b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #126   +/-   ##
=======================================
  Coverage   93.28%   93.28%           
=======================================
  Files          74       74           
  Lines         760      760           
  Branches       94       94           
=======================================
  Hits          709      709           
  Misses         51       51           

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