RFR: Merge jdk20

[Jesper Wilhelmsson]

Forwardport JDK 20 -> JDK 21

-------------

Commit messages:
 - Merge
 - 8299502: Usage of constructors of primitive wrapper classes should be avoided in javax.xml API docs
 - 8299499: Usage of constructors of primitive wrapper classes should be avoided in java.net API docs
 - 8299500: Usage of constructors of primitive wrapper classes should be avoided in java.text API docs
 - 8299501: Usage of constructors of primitive wrapper classes should be avoided in java.util API docs
 - 8299498: Usage of constructors of primitive wrapper classes should be avoided in java.lang API docs
 - 8300141: ProblemList java/util/concurrent/locks/Lock/OOMEInAQS.java with ZGC
 - 8300055: [BACKOUT] OPEN_MAX is no longer the max limit on macOS >= 10.6 for RLIMIT_NOFILE

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk&pr=12003&range=00.0
 - jdk20: https://webrevs.openjdk.org/?repo=jdk&pr=12003&range=00.1

Changes: https://git.openjdk.org/jdk/pull/12003/files
  Stats: 18 lines in 4 files changed: 5 ins; 3 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/12003.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12003/head:pull/12003

PR: https://git.openjdk.org/jdk/pull/12003