[SPARK-24531][TESTS] Remove version 2.2.0 from testing versions in HiveExternalCatalogVersionsSuite

Removing version 2.2.0 from testing versions in HiveExternalCatalogVersionsSuite as it is not present anymore in the mirrors and this is blocking all the open PRs.

running UTs

Author: Marco Gaido <marcogaido91@gmail.com>

Closes apache#21540 from mgaido91/SPARK-24531.

(cherry picked from commit 2824f14)
Signed-off-by: Xiao Li <gatorsmile@gmail.com>

Author: mgaido91

sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveExternalCatalogVersionsSuite.scala

@@ -160,7 +160,7 @@ class HiveExternalCatalogVersionsSuite extends SparkSubmitTestUtils {
 
 object PROCESS_TABLES extends QueryTest with SQLTestUtils {
   // Tests the latest version of every release line.
-  val testingVersions = Seq("2.0.2", "2.1.2", "2.2.0")
+  val testingVersions = Seq("2.0.2", "2.1.2", "2.2.1")
 
   protected var spark: SparkSession = _