[jdk21u-dev] RFR: Merge jdk21u:master

[Goetz Lindenmaier]

Merge build tag 21.0.9+7 from jdk21u to jdk21u-dev

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

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2170&range=00.0
 - jdk21u:master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2170&range=00.1

Changes: https://git.openjdk.org/jdk21u-dev/pull/2170/files
  Stats: 630 lines in 8 files changed: 524 ins; 81 del; 25 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2170.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2170/head:pull/2170

PR: https://git.openjdk.org/jdk21u-dev/pull/2170