[pom] Add a valid usage of relativePath to force .m2 lookup

The root is not oss-parent.

Author: hazendaz

pom.xml

@@ -5,6 +5,7 @@
         <groupId>org.sonatype.oss</groupId>
         <artifactId>oss-parent</artifactId>
         <version>9</version>
+        <relativePath />
     </parent>
 
     <groupId>io.github.git-commit-id</groupId>