RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merges tag jdk-21.0.7+2

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Commit messages:
 - 8345368: java/io/File/createTempFile/SpecialTempFile.java fails on Windows Server 2025
 - 8346671: java/nio/file/Files/probeContentType/Basic.java fails on Windows 2025
 - 8349603: [21u, 17u, 11u] Update GHA JDKs after Jan/25 updates
 - 8348562: ZGC: segmentation fault due to missing node type check in barrier elision analysis
 - 8340411: open source several 2D imaging tests
 - 8330702: Update failure handler to don't generate Error message if cores actions are empty
 - 8334371: [AIX] Beginning with AIX 7.3 TL1 mmap() supports 64K memory pages
 - 8347911: Limit the length of inflated text chunks
 - 8338571: [TestBug] DefaultCloseOperation.java test not working as expected wrt instruction after JDK-8325851 fix
 - 8343491: javax/management/remote/mandatory/connection/DeadLockTest.java failing with NoSuchObjectException: no such object in table
 - ... and 7 more: https://git.openjdk.org/shenandoah-jdk21u/compare/d2cbada0...3e556491

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

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/155/files
  Stats: 1472 lines in 28 files changed: 1150 ins; 229 del; 93 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/155.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/155/head:pull/155

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/155