[jugglinmike]

Ubuntu 24.04 is the latest LTS release that is fully-supported by GitHub:

https://github.com/actions/runner-images/tree/cd9258380ce08e025f0087395112154dcec91049:

[jugglinmike]

For reference, this fixed the following error in the GitHub Action "w3c/spec-prod@v2":

[8](https://github.com/w3c/at-driver/actions/runs/29439041887/job/87432954963#step:3:968)
  $ java -jar "/home/runner/work/_actions/w3c/spec-prod/v2/node_modules/.pnpm/vnu-jar@26.7.15/node_modules/vnu-jar/build/dist/vnu.jar" --also-check-css index.html
    Exception in thread "main" java.lang.UnsupportedClassVersionError: org/eclipse/jetty/client/Response$CompleteListener has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0
    	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1022)
    	at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
    	at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:800)
    	at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698)
    	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621)
    	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
    	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:527)
    	at nu.validator.validation.SimpleDocumentValidator.<clinit>(SimpleDocumentValidator.java:136)
    	at nu.validator.client.SimpleCommandLineValidator.main(SimpleCommandLineValidator.java:342)
  ❌  Not so good... please fix the issues above.