GH-1027: Revert throws Exception from testTokenOverridesUsernameAndPasswordAuth

Missed in the previous cleanup commit; this was a ripple from the now-
removed throws-SQLException on ArrowFlightConnectionConfigImpl.getPort().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ennuite

flight/flight-sql-jdbc-core/src/test/java/org/apache/arrow/driver/jdbc/ConnectionTest.java

@@ -130,7 +130,7 @@ public void testUnencryptedConnectionShouldOpenSuccessfullyWhenProvidedValidCred
    * connection should fail if a token is passed in.
    */
   @Test
-  public void testTokenOverridesUsernameAndPasswordAuth() throws Exception {
+  public void testTokenOverridesUsernameAndPasswordAuth() {
     final Properties properties = new Properties();
 
     properties.put(ArrowFlightConnectionProperty.HOST.camelName(), "localhost");