RFR: Merge openjdk/jdk21u-dev:master

[William Kemper]

Merges tag jdk-21.0.5+6

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Commit messages:
 - 8338139: {ClassLoading,Memory}MXBean::isVerbose methods are inconsistent with their setVerbose methods

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/76/files
  Stats: 204 lines in 6 files changed: 198 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/76.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/76/head:pull/76

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/76