[Gradle] AbstractCInteropCommonizerTask: Do not use ';' character in fileName

The ';' will later be used as path separator. Therefore,
using the ';' as joiner for multiple cinterop commonizer groups
will confuse the CLI argument parser inside the Commonizer

^KT-57796 Verification Pending

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/AbstractCInteropCommonizerTask.kt

@@ -25,7 +25,7 @@ internal abstract class AbstractCInteropCommonizerTask : DefaultTask() {
 }
 
 internal fun AbstractCInteropCommonizerTask.outputDirectory(group: CInteropCommonizerGroup): File {
-    val interopsDirectoryName = group.interops.map { it.interopName }.toSet().joinToString(";")
+    val interopsDirectoryName = group.interops.map { it.interopName }.toSet().joinToString(":")
     val groupDisambiguation = group.targets.joinToString { it.identityString } +
             group.interops.joinToString { it.uniqueName }