Update version to 4.39.0

Author: ymengesha

README.adoc

@@ -24,15 +24,15 @@ Maven
 <dependency>
     <groupId>com.hivemq</groupId>
     <artifactId>hivemq-google-cloud-pubsub-extension-customization-sdk</artifactId>
-    <version>4.38.0</version>
+    <version>4.39.0</version>
 </dependency>
 ----
 
 Gradle
 [source,groovy]
 
 ----
-implementation("com.hivemq:hivemq-google-cloud-pubsub-extension-customization-sdk:4.38.0")
+implementation("com.hivemq:hivemq-google-cloud-pubsub-extension-customization-sdk:4.39.0")
 ----
 
 == License

gradle.properties

@@ -1 +1 @@
-version=4.39.0-SNAPSHOT
+version=4.39.0