The fix updates the test to not synchronize on `Integer`, and use `Object` instead
------------- Commit messages: - fix Changes: https://git.openjdk.org/jdk/pull/29679/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29679&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8326603 Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/29679.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29679/head:pull/29679 PR: https://git.openjdk.org/jdk/pull/29679
