[jdk22u] RFR: 8323670: A few client tests intermittently throw ConcurrentModificationException

[Alexey Ivanov]

This pull request contains a backport of commit [70e7cdcb](https://github.com/openjdk/jdk/commit/70e7cdcb9ecedd455cf701b5c7ad05286ac0067d) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository. It fixes [JDK-8323670](https://bugs.openjdk.org/browse/JDK-8323670): _A few client tests intermittently throw ConcurrentModificationException_.

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Commit messages:
 - Backport 70e7cdcb9ecedd455cf701b5c7ad05286ac0067d

Changes: https://git.openjdk.org/jdk22u/pull/149/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=149&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323670
  Stats: 48 lines in 1 file changed: 6 ins; 4 del; 38 mod
  Patch: https://git.openjdk.org/jdk22u/pull/149.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/149/head:pull/149

PR: https://git.openjdk.org/jdk22u/pull/149