test: Fix test_measure_time_cpu_sync flakiness

[vdusek]

Closes: #1634

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.50%. Comparing base (e6e66ca) to head (ec09fb7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1663   +/-   ##
=======================================
  Coverage   92.50%   92.50%           
=======================================
  Files         157      157           
  Lines       10440    10440           
=======================================
+ Hits         9657     9658    +1     
+ Misses        783      782    -1     

Flag	Coverage Δ
unit	92.50% <ø> (+<0.01%)	⬆️

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