[SPARK-26137][CORE] Add missing blank line to comply with style

Author: Mark Pavey

core/src/main/scala/org/apache/spark/deploy/DependencyUtils.scala

@@ -24,6 +24,7 @@ import java.util.regex.Pattern
 import org.apache.commons.lang3.StringUtils
 import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs.{FileSystem, Path}
+
 import org.apache.spark.{SecurityManager, SparkConf, SparkException}
 import org.apache.spark.internal.Logging
 import org.apache.spark.util.{MutableURLClassLoader, Utils}