RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merges tag jdk-21.0.11+4

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Commit messages:
 - 8374555: No need for visible input warning in s.s.u.Password when not reading from System.in
 - 8329337: Problem list BufferStrategyExceptionTest.java on Windows
 - 8354469: Keytool exposes the password in plain text when command is piped using | grep
 - 8372710: Update ProcessBuilder/Basic regex
 - 8357141: Update to use jtreg 7.5.2
 - 8256289: java/awt/Focus/AppletInitialFocusTest/AppletInitialFocusTest1.java failed with "RuntimeException: Wrong focus owner: java.awt.Button[button1,41,36,56x23,label=Button1]"
 - 8339791: Refactor MiscUndecorated/ActiveAWTWindowTest.java
 - 8367583: sun/security/util/AlgorithmConstraints/InvalidCryptoDisabledAlgos.java fails after JDK-8244336
 - 8343234: (bf) Move java/nio/Buffer/LimitDirectMemory.java from ProblemList.txt to ProblemList-Virtual.txt
 - 8366261: Provide utility methods for sun.security.util.Password
 - ... and 125 more: https://git.openjdk.org/shenandoah-jdk21u/compare/2e594b6c...af43743e

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=236&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/236/files
  Stats: 31928 lines in 617 files changed: 14264 ins; 7461 del; 10203 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/236.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/236/head:pull/236

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/236