memory: fix data race in arbitrator tests

[solotzg]

What problem does this PR solve?

Issue Number: ref #58194

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

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[codecov]

Codecov Report

❌ Patch coverage is 91.54930% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.7049%. Comparing base (df3d1b7) to head (aa654a9).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65569        +/-   ##
================================================
- Coverage   77.8408%   77.7049%   -0.1360%     
================================================
  Files          1971       1902        -69     
  Lines        540982     532517      -8465     
================================================
- Hits         421105     413792      -7313     
- Misses       118218     118714       +496     
+ Partials       1659         11      -1648     

Flag	Coverage Δ
integration	41.5454% <11.5107%> (-6.6512%)	⬇️
unit	76.7689% <91.5493%> (+0.3080%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	56.7974% <ø> (ø)
parser	∅ <ø> (∅)
br	48.7098% <ø> (-12.4449%)	⬇️

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