fix: align streamable HTTP module parent version

Author: kamikaz1k

acp-streamable-http-jetty/pom.xml

@@ -7,7 +7,7 @@
     <parent>
         <groupId>com.agentclientprotocol</groupId>
         <artifactId>acp-java-sdk</artifactId>
-        <version>0.13.0-SNAPSHOT</version>
+        <version>0.15.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>acp-streamable-http-jetty</artifactId>