Use Java 22 for CI builds.

[DavidWhitlock]

Resolve #465 by using Java 22 for GitHub Continuous Integration builds.

[DavidWhitlock]

Looks like the CI build is failing because

[INFO]      [java] The following errors occurred during analysis:
[INFO]      [java]   Error scanning java/lang/Object for referenced classes
[INFO]      [java]     java.lang.IllegalArgumentException: Unsupported class file major version 66
[INFO]      [java]       At org.objectweb.asm.ClassReader.<init>(ClassReader.java:199)
[INFO]      [java]       At org.objectweb.asm.ClassReader.<init>(ClassReader.java:180)
[INFO]      [java]       At org.objectweb.asm.ClassReader.<init>(ClassReader.java:166)
[INFO]      [java]       At edu.umd.cs.findbugs.asm.FBClassReader.<init>(FBClassReader.java:35)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.engine.asm.ClassReaderAnalysisEngine.analyze(ClassReaderAnalysisEngine.java:48)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.engine.asm.ClassReaderAnalysisEngine.analyze(ClassReaderAnalysisEngine.java:34)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getClassAnalysis(AnalysisCache.java:261)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.engine.ClassInfoAnalysisEngine.analyze(ClassInfoAnalysisEngine.java:75)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.engine.ClassInfoAnalysisEngine.analyze(ClassInfoAnalysisEngine.java:38)
[INFO]      [java]       At edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getClassAnalysis(AnalysisCache.java:261)
[INFO]      [java]       At edu.umd.cs.findbugs.FindBugs2.buildReferencedClassSet(FindBugs2.java:806)
[INFO]      [java]       At edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:249)
[INFO]      [java]       At edu.umd.cs.findbugs.FindBugs.runMain(FindBugs.java:395)
[INFO]      [java]       At edu.umd.cs.findbugs.FindBugs2.main(FindBugs2.java:1231)

Interestingly enough, it doesn't reproduce for me locally with Java 22.

And the version of the spotbugs plugin that is used locally is 4.8.4.0, but on the CI build, it's 4.7.3.4. I wonder why that is.

[DavidWhitlock]

Oh, it appears that the 1.0.0 version of the top-level POM that was deployed to Maven central doesn't have the newer plugin versions.

https://repo.maven.apache.org/maven2/io/github/davidwhitlock/joy/joy/1.0.0/joy-1.0.0.pom

I wonder how that happened. I guess I'll have to deploy a new version of the top-level POM. Swell.

Sure enough, I deleted the top-level POM from my local repository and the build failed after downloading the one from Maven Central.