[jdk21u-dev] RFR: 8343936: Adjust timeout in test javax/management/monitor/DerivedGaugeMonitorTest.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

Resolved ProblemList, probably clean.

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Commit messages:
 - Backport 4fa760a1ed24ad2e6fba6dca51c5cf7dc7436719

Changes: https://git.openjdk.org/jdk21u-dev/pull/1518/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1518&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343936
  Stats: 9 lines in 2 files changed: 5 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1518.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1518/head:pull/1518

PR: https://git.openjdk.org/jdk21u-dev/pull/1518