[MINOR][SQL] A minor log line fix

`jars` in the log line is an array, so `$jars` doesn't print its content.

Author: Cheng Lian <lian@databricks.com>

Closes #9494 from liancheng/minor.log-fix.

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveContext.scala

@@ -309,7 +309,8 @@ class HiveContext private[hive](
           .map(_.toURI.toURL)
 
       logInfo(
-        s"Initializing HiveMetastoreConnection version $hiveMetastoreVersion using $jars")
+        s"Initializing HiveMetastoreConnection version $hiveMetastoreVersion " +
+          s"using ${jars.mkString(":")}")
       new IsolatedClientLoader(
         version = metaVersion,
         execJars = jars.toSeq,