Explicitly use OpenSSL::Digest to avoid deprecated version
Explicitly use OpenSSL::Digest to avoid deprecated version

Per ruby/ruby#446 use of OpenSSL::Digest:Digest is deprecated and
caused warnings

Upstream json-jwt also requires update. Pull sent to nov/json-jwt#16

University-of-Auckland/rapidconnect,ausaccessfed/rapidconnect,ausaccessfed/rapidconnect,ausaccessfed/rapidconnect,University-of-Auckland/rapidconnect,University-of-Auckland/rapidconnect,University-of-Auckland/rapidconnect,ausaccessfed/rapidconnect