doc: change version to reflect S3 customization API

Author: vlsi

gradle.properties

@@ -1,7 +1,7 @@
 org.gradle.parallel=true
 kotlin.parallel.tasks.in.project=true
 
-current.version=1.7.0
+current.version=1.9.0
 artifact.name=gradle-s3-build-cache
 description=Gradle S3 Build Cache