Fix merge sarif task

[rock3r]

For some reason stopped working in #571...

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':mergeSarifReports'.
// ...
Caused by: java.lang.NoSuchMethodError: 'void io.github.detekt.sarif4k.ToolComponent.<init>(io.github.detekt.sarif4k.ToolComponentReference, java.util.List, java.lang.String, java.lang.String, io.github.detekt.sarif4k.MultiformatMessageString, java.lang.String, java.util.Map, java.lang.String, java.lang.String, java.lang.Boolean, java.lang.String, java.lang.String, java.util.List, java.lang.String, java.lang.String, java.util.List, java.lang.String, java.lang.String, java.lang.String, io.github.detekt.sarif4k.PropertyBag, java.lang.String, java.util.List, java.lang.String, io.github.detekt.sarif4k.MultiformatMessageString, java.util.List, java.util.List, io.github.detekt.sarif4k.TranslationMetadata, java.lang.String, int, kotlin.jvm.internal.DefaultConstructorMarker)'
	at MergeSarifTask$merge$merged$6.invoke(MergeSarifTask.kt:53)
	at MergeSarifTask$merge$merged$6.invoke(MergeSarifTask.kt:50)
	at kotlin.sequences.TransformingSequence$iterator$1.next(Sequences.kt:210)
	at kotlin.sequences.SequencesKt___SequencesKt.toList(_Sequences.kt:811)
	at MergeSarifTask.merge(MergeSarifTask.kt:56)
// ...

This task is to see what's going on and fix the task, and re-enable the CI job step — or maybe, if we can't get it to work, just drop this.