Fix pool flaky test

[sfc-gh-knozderko]

Description

Fix pool flaky test.

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.38%. Comparing base (b2b0ddc) to head (ae8b9de).

Additional details and impacted files

@@                         Coverage Diff                          @@
##           pool/SNOW-860872-connection-pool     #950      +/-   ##
====================================================================
+ Coverage                             85.32%   85.38%   +0.06%     
====================================================================
  Files                                   106      106              
  Lines                                 10668    10668              
  Branches                               1024     1024              
====================================================================
+ Hits                                   9102     9109       +7     
+ Misses                                 1319     1312       -7     
  Partials                                247      247              

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