[jdk21u-dev] RFR: Merge jdk21u:master

[Goetz Lindenmaier]

Merge build tag 21.0.10-ga from jdk21u to jdk21u-dev

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Commit messages:
 - Merge
 - 8375447: Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.10
 - 8374209: [17u,21u] Backout JDK-8361748 due to JDK-8373727
 - 8359501: Enhance Handling of URIs
 - 8368032: Enhance Certificate Checking
 - 8365280: Enhance JOptionPane
 - 8362632: Improve HttpServer Request handling
 - 8362308: Enhance Bitmap operations
 - 8365271: Improve Swing supports
 - 8365058: Enhance CopyOnWriteArraySet
 - ... and 3 more: https://git.openjdk.org/jdk21u-dev/compare/310a042b...73b059fd

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2557&range=00.0
 - jdk21u:master: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2557&range=00.1

Changes: https://git.openjdk.org/jdk21u-dev/pull/2557/files
  Stats: 1267 lines in 38 files changed: 963 ins; 149 del; 155 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2557.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2557/head:pull/2557

PR: https://git.openjdk.org/jdk21u-dev/pull/2557