chore: update http-proxy-middleware to version 4.1.1

[bjohansebas]

Summary
Adds tests that were removed during the migration to v3 and later to v4.

#5641 (comment)

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Latest commit: f113b00

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.90%. Comparing base (4810909) to head (f113b00).
⚠️ Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #5689      +/-   ##
==========================================
- Coverage   88.93%   88.90%   -0.03%     
==========================================
  Files          13       13              
  Lines        5919     5922       +3     
==========================================
+ Hits         5264     5265       +1     
- Misses        655      657       +2     

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