[jdk21u-dev] RFR: 8348299: Update List/ItemEventTest/ItemEventTest.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle.

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Commit messages:
 - Backport 605b53e4f8857c58a72fa361f8787c563d6dab90

Changes: https://git.openjdk.org/jdk21u-dev/pull/1452/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1452&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348299
  Stats: 98 lines in 1 file changed: 44 ins; 8 del; 46 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1452.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1452/head:pull/1452

PR: https://git.openjdk.org/jdk21u-dev/pull/1452