Upgrade the bundled JDK version to 25 LTS

Es werden keine Dateien oder Tests genannt; beginne damit, den Konfigurations- oder Build-Einstiegspunkt zu finden, der das gebündelte JDK auswählt, und prüfe, wie die Extension es paketiert. Stelle sicher, dass das resultierende Bundle JDK 25 LTS verwendet und mit UseCompactObjectHeaders erfolgreich startet.

Is your feature request related to a problem? Please describe.
The currently bundled JDK version is 21, which does not recognize the UseCompactObjectHeaders VM option; upgrading to the latest LTS version (25) resolves this issue.

{
  message: 'Starting Java server with: /Users/leo/.vscode/extensions/redhat.java-1.55.0-darwin-arm64/jre/21.0.11-macosx-aarch64/bin/java --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable -javaagent:/Users/leo/.vscode/extensions/redhat.java-1.55.0-darwin-arm64/lombok/lombok-1.18.39-4050.jar -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/leo/Library/Application Support/Code/User/workspaceStorage/86672a3e9479386619cea829e48e468b/redhat.java -Daether.dependencyCollector.impl=bf -jar /Users/leo/.vscode/extensions/redhat.java-1.55.0-darwin-arm64/server/plugins/org.eclipse.equinox.launcher_1.7.200.v20260619-2039.jar -configuration /Users/leo/Library/Application Support/Code/User/globalStorage/redhat.java/1.55.0/config_mac -data /Users/leo/Library/Application Support/Code/User/workspaceStorage/86672a3e9479386619cea829e48e468b/redhat.java/jdt_ws',
  level: 'info',
  timestamp: '2026-06-29 11:05:18.884'
}
{
  message: 'Picked up JAVA_TOOL_OPTIONS: -XX:+UseZGC -XX:+UseStringDeduplication -XX:+UseCompactObjectHeaders\n' +
    "Unrecognized VM option 'UseCompactObjectHeaders'\n" +
    'Error: Could not create the Java Virtual Machine.\n' +
    'Error: A fatal exception has occurred. Program will exit.\n',
  level: 'info',
  timestamp: '2026-06-29 11:05:19.273'
}

Describe the solution you'd like
Upgrade the bundled JDK version to 25 LTS