RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merges tag jdk-21.0.9+7

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Commit messages:
 - 8365375: Method SU3.setAcceleratorSelectionForeground assigns to acceleratorForeground
 - 8348760: RadioButton is not shown if JRadioButtonMenuItem is rendered with ImageIcon in WindowsLookAndFeel

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

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/219/files
  Stats: 630 lines in 8 files changed: 524 ins; 81 del; 25 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/219.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/219/head:pull/219

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/219