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

pom.xml

@@ -18,7 +18,7 @@
     <artifactId>uprotocol-core-api</artifactId>
     <name>uProtocol Core uEs API</name>
     <description>This project contains the built artifacts for core uProtocol services (uSubscription, uDiscovery, uTwin, etc..). Artifacts include language specific messages and client/server stubs</description>
-    <version>1.5.7</version>
+    <version>1.5.8-SNAPSHOT</version>
     <packaging>jar</packaging>
     <url>https://github.com/eclipse-uprotocol/uprotocol-core-api/</url>
 
@@ -55,7 +55,7 @@
         <connection>scm:git:${project.scm.url}</connection>
         <developerConnection>scm:git:${project.scm.url}</developerConnection>
         <url>https://github.com/eclipse-uprotocol/uprotocol-core-api.git</url>
-      <tag>uprotocol-core-api-1.5.7</tag>
+      <tag>HEAD</tag>
   </scm>