Upgrade from LTIv1.1 to LTIv1.3 and remove deprecated libs

Instructure Canvas has supported LTIv1.2 for for some time, and currently supports LTIv1.3
The `oauth-signature@1.5.0` is deprecated (not been updated in 8 years and as 8year old stale pulls) https://github.com/bettiolo/oauth-signature-js
The dependent `crypto-js@3.1.9-1` lib is flagging security issues, and is nearly officially deprecated https://github.com/brix/crypto-js/issues/512
