RFR: 8355746: Start of release updates for JDK 26 [v2]

[Nizar Benalla]

> Get JDK 26 underway.

Nizar Benalla has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:

 - Update release date
 - Update --release 25 symbol information for JDK 25 build 21
   The macOS/AArch64 build 21 was taken from https://jdk.java.net/25/
 - Merge branch 'master' into jdk.8355746
   
   # Conflicts:
   #	test/langtools/tools/javac/versions/Versions.java
 - feedback: never bump ASM version
 - Update copyright years
   
   Note: any commit hashes below might be outdated due to subsequent
   history rewriting (e.g. git rebase).
   
    + update src/java.compiler/share/classes/javax/lang/model/SourceVersion.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractAnnotationValueVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractAnnotationValueVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractElementVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractElementVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractTypeVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/AbstractTypeVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/ElementKindVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/ElementKindVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/ElementScanner14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/ElementScannerPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleAnnotationValueVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleAnnotationValueVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleElementVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleElementVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleTypeVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/SimpleTypeVisitorPreview.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/TypeKindVisitor14.java due to 6077665a274
    + update src/java.compiler/share/classes/javax/lang/model/util/TypeKindVisitorPreview.java due to 6077665a274
    + update src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassFile.java due to 6077665a274
    + update src/jdk.compiler/share/classes/com/sun/tools/javac/processing/PrintingProcessor.java due to 6077665a274
    + update test/langtools/tools/javac/api/TestGetSourceVersions.java due to 6077665a274
    + update test/langtools/tools/javac/classfiles/ClassVersionChecker.java due to 6077665a274
    + update test/langtools/tools/javac/options/HelpOutputColumnWidthTest.java due to 6077665a274
    + update test/langtools/tools/javac/versions/Versions.java due to 6077665a274
 - Update --release 25 symbol information for JDK 24 build 20
   The macOS/AArch64 build 20 was taken from https://jdk.java.net/25/
 - initial commit start-of-JDK-26

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

Changes: https://git.openjdk.org/jdk/pull/25008/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25008&range=01
  Stats: 1390 lines in 53 files changed: 1299 ins; 16 del; 75 mod
  Patch: https://git.openjdk.org/jdk/pull/25008.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25008/head:pull/25008

PR: https://git.openjdk.org/jdk/pull/25008