Fix flaky test

[sentrivana]

There's a test in test_utils.py that flakes very often, but only on Python 3.8 and only in CI (locally it's all fine). I've tried a couple of ways to fix it but at this point it's not worth the effort, so just skipping it on 3.8.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.57%. Comparing base (984f29a) to head (278baa4).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4198      +/-   ##
==========================================
- Coverage   79.58%   79.57%   -0.02%     
==========================================
  Files         141      141              
  Lines       15737    15737              
  Branches     2675     2675              
==========================================
- Hits        12525    12522       -3     
- Misses       2367     2369       +2     
- Partials      845      846       +1     

see 2 files with indirect coverage changes