Upgrade the bundled JDK version to 25 LTS

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

No files or tests are named; start by locating the configuration or build entry point that selects the bundled JDK and checking how the extension packages it. Verify that the resulting bundle uses JDK 25 LTS and starts successfully with UseCompactObjectHeaders.