Migrate to Pitest (itself and/or Gradle plugin) compatible with Java 25

[dtruebin]

As of 6c94196, :pitest task run against Java 25 is failing with:

> Task :pitest FAILED
1:26:43 PM PIT >> INFO : Verbose logging is disabled. If you encounter a problem, please enable it before reporting an issue.
Error: Exception in thread "main" java.lang.IllegalArgumentException: Unsupported class file major version 69
	at org.objectweb.asm.ClassReader.<init>(ClassReader.java:199)
	at org.objectweb.asm.ClassReader.<init>(ClassReader.java:180)
	at org.objectweb.asm.ClassReader.<init>(ClassReader.java:166)
	at org.pitest.bytecode.analysis.ClassTree.fromBytes(ClassTree.java:38)
	at org.pitest.classpath.DefaultCodeSource.lambda$codeTrees$1(DefaultCodeSource.java:35)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:214)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:214)
	at java.base/java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1693)
	at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:147)
	at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:588)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:574)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
	at java.base/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)
	at java.base/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:668)
	at org.pitest.mutationtest.verify.DefaultBuildVerifier.verify(DefaultBuildVerifier.java:41)
	at org.pitest.mutationtest.verify.CompoundBuildVerifierFactory.lambda$null$1(CompoundBuildVerifierFactory.java:20)
	at java.base/java.util.stream.ReferencePipeline$7$1FlatMap.accept(ReferencePipeline.java:288)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:214)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1716)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:570)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:560)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:265)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:723)
	at org.pitest.mutationtest.verify.CompoundBuildVerifierFactory.lambda$create$2(CompoundBuildVerifierFactory.java:21)
	at org.pitest.mutationtest.tooling.MutationCoverage.verifyBuildSuitableForMutationTesting(MutationCoverage.java:283)
	at org.pitest.mutationtest.tooling.MutationCoverage.runReport(MutationCoverage.java:116)
	at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:136)
	at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:63)
	at org.pitest.mutationtest.commandline.MutationCoverageReport.runReport(MutationCoverageReport.java:98)
	at org.pitest.mutationtest.commandline.MutationCoverageReport.main(MutationCoverageReport.java:45)

Check https://github.com/szpak/gradle-pitest-plugin/releases