[jfx21u] Integrated: Merge jfx:jfx21

[Kevin Rushforth]

Merge `jfx:jfx21` branch into `jfx21u:master` (21.0.1 is a superset of 21).

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Commit messages:
 - Merge remote-tracking branch 'jfx/jfx21' into merge-2023-07-28
 - 8313227: Correct attenuation indicator for removed lights
 - 8312528: Move Subscription interface from javafx.beans to javafx.util

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

Changes: https://git.openjdk.org/jfx21u/pull/4/files
  Stats: 21 lines in 13 files changed: 9 ins; 7 del; 5 mod
  Patch: https://git.openjdk.org/jfx21u/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/4/head:pull/4

PR: https://git.openjdk.org/jfx21u/pull/4