[8.11](backport #3685) prevent data race in testing artifact fetcher

[mergify]

This is an automatic backport of pull request #3685 done by Mergify.

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[elasticmachine]

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• Start Time: 2023-11-03T16:19:17.387+0000

• Duration: 43 min 16 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6501
Skipped	59
Total	6560

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	98.81% (83/84)	👍
Files	66.556% (201/302)	👍
Classes	65.419% (367/561)	👍
Methods	52.869% (1161/2196)	👍
Lines	39.166% (13533/34553)	👎 -0.041
Conditionals	100.0% (0/0)	💚

[leehinman]

/test

[leehinman]

/test

[elastic-sonarqube]

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