test: Fix flaky DNS tests that check for valid IP

[TwiN]

Summary

Fix flaky DNS tests that check for valid IP

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.02%. Comparing base (9157b5b) to head (527c4ce).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #968   +/-   ##
=======================================
  Coverage   76.02%   76.02%           
=======================================
  Files          74       74           
  Lines        6706     6706           
=======================================
  Hits         5098     5098           
  Misses       1306     1306           
  Partials      302      302           

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