RFR: Merge jdk20

[Jesper Wilhelmsson]

Forwardport JDK 20 -> JDK 21

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Commit messages:
 - Merge remote-tracking branch 'jdk20/master' into Merge_jdk20
 - 8299689: Make use of JLine for Console as "opt-in"

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=11913&range=00.0
 - jdk20: https://webrevs.openjdk.org/?repo=jdk&pr=11913&range=00.1

Changes: https://git.openjdk.org/jdk/pull/11913/files
  Stats: 48 lines in 4 files changed: 24 ins; 7 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/11913.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11913/head:pull/11913

PR: https://git.openjdk.org/jdk/pull/11913