chore: cleanup Areas annotation

[DjordyKoert]

Description

Cleans up the Area annotation/attribute to trigger a deprecation warning whenever a list of strings isn't passed.

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)
• I have made corresponding changes to the changelog (CHANGELOG.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.18%. Comparing base (3aaa734) to head (52c3219).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2431      +/-   ##
==========================================
+ Coverage   90.12%   90.18%   +0.06%     
==========================================
  Files          94       94              
  Lines        3067     3067              
==========================================
+ Hits         2764     2766       +2     
+ Misses        303      301       -2     

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