fix: Put marker file into .tmp directory

Author: koppor

src/main/groovy/dev/jbang/gradle/Banner.groovy

@@ -67,7 +67,7 @@ abstract class Banner implements BuildService<Params> {
 
         boolean printBanner = null == System.getProperty(ORG_KORDAMP_BANNER) || Boolean.getBoolean(ORG_KORDAMP_BANNER)
 
-        File parent = new File(gradle.gradleUserHomeDir, 'caches')
+        File parent = new File(gradle.gradleUserHomeDir, '.tmp')
         File markerFile = getMarkerFile(parent)
         if (!markerFile.exists()) {
             markerFile.parentFile.mkdirs()
@@ -105,4 +105,4 @@ abstract class Banner implements BuildService<Params> {
                 File.separator +
                 'marker.txt')
     }
-}
+}