Increase unit test timeout to 20 minutes

[nev21]

Increased timeout for unit tests from 15 to 20 minutes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.87%. Comparing base (59dd196) to head (6f2aef6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #280   +/-   ##
=======================================
  Coverage   92.87%   92.87%           
=======================================
  Files          78       78           
  Lines        3564     3564           
  Branches      904      904           
=======================================
  Hits         3310     3310           
  Misses        254      254           

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[nevware21-bot]

Approved by nevware21-bot