chore: use spotify fmt plugin in build.sh

Author: diegomarquezp

.kokoro/build.sh

@@ -82,7 +82,7 @@ test)
     RETURN_CODE=$?
     ;;
 lint)
-    mvn com.coveo:fmt-maven-plugin:check
+    mvn com.spotify.fmt:fmt-maven-plugin:check
     RETURN_CODE=$?
     ;;
 javadoc)