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

Author: mgaido91

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

@@ -195,7 +195,7 @@ 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", "2.2.1", "2.3.0")
+  val testingVersions = Seq("2.0.2", "2.1.2", "2.2.1", "2.3.0")
 
   protected var spark: SparkSession = _