test(zeromq): pause send routine for 100ms

[b00f]

Description

In rare cases, ZMQ tests on Windows only time out. This PR attempts to solve this issue in GitHub Actions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.02%. Comparing base (86a8ba9) to head (9db4a2c).
⚠️ Report is 397 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2226      +/-   ##
==========================================
- Coverage   75.07%   74.02%   -1.05%     
==========================================
  Files         234      295      +61     
  Lines       12156    18276    +6120     
==========================================
+ Hits         9126    13529    +4403     
- Misses       2582     4191    +1609     
- Partials      448      556     +108     

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