Update the next version to 0.9.0-SNAPSHOT (#81)

* [maven-release-plugin] prepare release v0.8.0

* [maven-release-plugin] prepare for next development iteration

Author: hanahmily

pom.xml

@@ -22,7 +22,7 @@
 
     <groupId>org.apache.skywalking</groupId>
     <artifactId>banyandb-java-client</artifactId>
-    <version>0.8.0-SNAPSHOT</version>
+    <version>0.9.0-SNAPSHOT</version>
 
     <parent>
         <groupId>org.apache</groupId>