chore: Disallow Git dependencies

[FrederikBolding]

Disallow Git dependencies after bumping Yarn to the latest version.

---

Note

Low Risk
Low risk config hardening: it only changes Yarn settings to prevent installing Git URL dependencies, which may cause installs to fail only if such dependencies are introduced.

Overview
Adds Yarn configuration to disallow all Git-based dependencies by setting approvedGitRepositories: [] in .yarnrc.yml, tightening supply-chain security for installs.

^{Reviewed by Cursor Bugbot for commit 246828e. Bugbot is set up for automated code reviews on this repo. Configure here.}

[FrederikBolding]

Yarn automatically reordered these

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (84c2d21) to head (246828e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4000   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files         425      425           
  Lines       12368    12368           
  Branches     1949     1949           
=======================================
  Hits        12193    12193           
  Misses        175      175           

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