Class file versions 65 in linkage checker

I love the Linkage Checker! However, I am now working in a large project compiling to class file version 65 with java 21. This does not seem to be supported at https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/a4649811a02dc6eb2f6b67626004b8424c1ae58b/dependencies/src/main/java/com/google/cloud/tools/opensource/classpath/ClassDumper.java#L179

I would love to have the supported class file versions to be bumped to a more recent version so I can use this amazing tool in my current project!

Start in dependencies/src/main/java/com/google/cloud/tools/opensource/classpath/ClassDumper.java at the referenced line and inspect how supported class file versions are handled. Update the supported versions for Java 21, then verify that the Linkage Checker accepts class files compiled to version 65.

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