use random port for test:webworker

[rluvaton]

Purpose (TL;DR) - mandatory

Dev machine may already have port 8080 taken, which will fail the test, so listening to a random port instead

How to verify - mandatory

1. Check out this branch
2. npm install
3. npm test

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1eb070a) 96.05% compared to head (bb317a2) 96.05%.

❗ Current head bb317a2 differs from pull request most recent head a59bb6e. Consider uploading reports for the commit a59bb6e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2568   +/-   ##
=======================================
  Coverage   96.05%   96.05%           
=======================================
  Files          41       41           
  Lines        1928     1928           
=======================================
  Hits         1852     1852           
  Misses         76       76           

Flag	Coverage Δ
unit	96.05% <ø> (ø)

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