Change List definition

This is causing compilation issues in the test directory

Author: Caitlin Bales (MSFT)

graphsdk/src/androidTest/java/com/microsoft/graph/functional/OutlookTests.java

@@ -63,7 +63,7 @@ public void testGetFindMeetingTimes() {
             tenantUser = users.getCurrentPage().get(1);
         }
 
-        List<AttendeeBase> attendees = new ArrayList<>();
+        ArrayList<AttendeeBase> attendees = new ArrayList<AttendeeBase>();
         AttendeeBase attendeeBase = new AttendeeBase();
         EmailAddress email = new EmailAddress();
         email.address = tenantUser.mail;