Set version to 4.5.9-SNAPSHOT

Author: vietj

pom.xml

@@ -24,13 +24,13 @@
   </parent>
 
   <artifactId>vertx-junit5</artifactId>
-  <version>4.5.8</version>
+  <version>4.5.9-SNAPSHOT</version>
 
   <name>Vert.x JUnit 5 support :: Core</name>
 
   <properties>
     <doc.skip>false</doc.skip>
-    <stack.version>4.5.8</stack.version>
+    <stack.version>4.5.9-SNAPSHOT</stack.version>
     <junit-jupiter.version>5.8.2</junit-jupiter.version>
     <apiguardian-api.version>1.0.0</apiguardian-api.version>
     <assertj-core.version>3.21.0</assertj-core.version>