RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merges tag jdk-21.0.9+2

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Commit messages:
 - 8358452: JNI exception pending in Java_sun_awt_screencast_ScreencastHelper_remoteDesktopKeyImpl of screencast_pipewire.c:1214 (ID: 51119)
 - 8334016: Make PrintNullString.java automatic
 - 8355262: Test sun/security/ssl/SSLSessionImpl/NoInvalidateSocketException.java failed: accept timed out
 - 8328244: Convert javax/swing/JSlider/6742358/bug6742358.java applet test to main
 - 8328279: Convert java/awt/Cursor/CursorOverlappedPanelsTest test to main
 - 8328262: Convert javax/swing/JSplitPane/8132123/bug8132123.java applet test to main
 - 8328154: Convert sun/java2d/loops/CopyAreaSpeed.java applet test to main
 - 8328248: Convert javax/swing/JSlider/6587742/bug6587742.java applet test to main
 - 8327756: Convert javax/swing/JSlider/4987336/bug4987336.java applet to main
 - 8327873: Convert javax/swing/border/Test4247606.java applet test to main
 - ... and 187 more: https://git.openjdk.org/shenandoah-jdk21u/compare/54f20959...aab1e218

The webrev contains the conflicts with master:
 - merge conflicts: https://webrevs.openjdk.org/?repo=shenandoah-jdk21u&pr=209&range=00.conflicts

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/209/files
  Stats: 31104 lines in 690 files changed: 17697 ins; 9955 del; 3452 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/209.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/209/head:pull/209

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/209