Kill another redundant empty line.

Author: armiol

testutil-gcloud/src/main/java/io/spine/testing/server/storage/datastore/Emulator.java

@@ -21,7 +21,6 @@ final class Emulator {
     private static final DockerImageName IMAGE =
             DockerImageName.parse("gcr.io/google.com/cloudsdktool/google-cloud-cli:441.0.0-emulators");
 
-
     /**
      * Currently running emulators, per project ID with which each of them is running.
      */