Rename SingleColumnRowMapperTest to align with the other tests

Author: izeye

spring-jdbc/src/test/java/org/springframework/jdbc/core/SingleColumnRowMapperTest.java renamed to spring-jdbc/src/test/java/org/springframework/jdbc/core/SingleColumnRowMapperTests.java

@@ -36,7 +36,7 @@
  * @author Kazuki Shimizu
  * @since 5.0.4
  */
-public class SingleColumnRowMapperTest {
+public class SingleColumnRowMapperTests {
 
 	@Test // SPR-16483
 	public void useDefaultConversionService() throws SQLException {