Switch to TLS 1.2 encryption for downloading contacts

[torrin47]

EME returns an error when trying to load contacts.xml from the EDG server. We believe this is due to disabling TLS 1.0 and forcing more secure encryption per EPA requirements:

https://stackoverflow.com/questions/22627977/the-underlying-connection-was-closed-an-unexpected-error-occurred-on-a-send

Since we can't roll back the security settings, it looks like we need a fix and a new build.

[torrin47]

Happily, this is addressed by the standard Esri TLS patch - no EME build is required.