Discovery broken when the Provider returns a set of JWKs

[hotgazpacho]

When using discovery, and the response from the Provider is a JSON::JWK::Set, a JSON::JWK::Set::KidNotFound error is raised. Looking through the locals at the point of the error, it seems that the kid is not being passed down at all. It therefor can't find the key in the set to verify the token.

>>  key
=> [{"kid"=>"bkj-VXvyRclrNmDLT7FS8_-8pc6baq5cmLpu7Usv2G8", "kty"=>"RSA", "alg"=>"RS256", "use"=>"sig", "n"=>"kAqMplKg8U_szOGaaHtob9PvuqOpT5P0iRiN_UyecOEslQyT0B2zHoVFojeLp5zQ4qb-jhAspXedUh1y4RSSPyjIDKx4x7GQvceGb2ewJIQXV_My2FVlNeyyPpYM1JlMlDbgKTVy2CiTi75MKd3CF95bFnnskUi48uS78XjNSZhvonMmzVO3_mFw5m3KxoQDhdMKPjZ2kM6x9H9WJ-J06x_lQA3STDnYADdAQA9fk6985AMpjpGakn1RMgVXSTcr3KBLaliWNGa1L0CQRv7B_0euIj78j1gLSZonpXYNVkVFwUy3GTFTtjrobhc-39isjqGadQeAQmj7547WtHaOVQ", "e"=>"AQAB"}]
>>  key.class
=> JSON::JWK::Set
>>  kid
=> nil

Relevant stack trace:

json-jwt (1.6.1) lib/json/jws.rb:116:in `with_jwk_support'
json-jwt (1.6.1) lib/json/jws.rb:88:in `valid?'
json-jwt (1.6.1) lib/json/jws.rb:25:in `verify!'
json-jwt (1.6.1) lib/json/jws.rb:162:in `decode_compact_serialized'
json-jwt (1.6.1) lib/json/jwt.rb:77:in `decode_compact_serialized'
json-jwt (1.6.1) lib/json/jose.rb:39:in `decode'
openid_connect (0.9.2) lib/openid_connect/response_object/id_token.rb:60:in `decode'
omniauth-openid-connect (0.2.3) lib/omniauth/strategies/openid_connect.rb:173:in `decode_id_token'
omniauth-openid-connect (0.2.3) lib/omniauth/strategies/openid_connect.rb:162:in `block in access_token'
omniauth-openid-connect (0.2.3) lib/omniauth/strategies/openid_connect.rb:169:in `access_token'
omniauth-openid-connect (0.2.3) lib/omniauth/strategies/openid_connect.rb:102:in `callback_phase'
omniauth (1.3.1) lib/omniauth/strategy.rb:227:in `callback_call'
omniauth (1.3.1) lib/omniauth/strategy.rb:184:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/strategy.rb:186:in `call!'
omniauth (1.3.1) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.3.1) lib/omniauth/builder.rb:63:in `call'