Upgrades spring to 3.4.0 (#2154)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/EntityFactory.java

@@ -113,5 +113,4 @@ public interface EntityFactory {
      * @return {@link TargetFilterQueryBuilder} object
      */
     TargetFilterQueryBuilder targetFilterQuery();
-
-}
+}

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/model/Artifact.java

@@ -48,5 +48,4 @@ public interface Artifact extends TenantAwareBaseEntity {
      * @return size of the artifact in bytes.
      */
     long getSize();
-
-}
+}