feat: fixed missing version placeholder for new pom file (#2506)

Author: ldetmer

google-api-client-apache-v5/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>com.google.api-client</groupId>
         <artifactId>google-api-client-parent</artifactId>
-        <version>2.6.1-SNAPSHOT</version>
+        <version>2.6.1-SNAPSHOT</version><!-- {x-version-update:google-api-client:current} -->
     </parent>
     <artifactId>google-api-client-apache-v5</artifactId>
     <name>Apache extensions to the Google APIs Client Library for Java</name>