[SB3 Update] JDBC source and supplier updates

- Fix jdbc-source tests to use new Spring Integration Test Binder
- Fix jdbc-supplier test to check root cause

supplier/jdbc-supplier/src/test/java/org/springframework/cloud/fn/supplier/jdbc/DefaultJdbcSupplierTests.java

@@ -91,6 +91,7 @@ public class DefaultJdbcSupplierTests {
 	void verifyNoIntMessageGroupTable() {
 		assertThatExceptionOfType(BadSqlGrammarException.class)
 				.isThrownBy(() -> this.jdbcTemplate.queryForList("SELECT * FROM INT_MESSAGE_GROUP"))
+				.havingCause()
 				.withMessageContaining("Table \"INT_MESSAGE_GROUP\" not found;");
 	}