SessionsControllerConcern.relying_party raises NoMethodError

* This ports the changes to `ReauthenticationControllerConcern` to match
	for consistency
	* see: 447e114
	* #27

lib/devise/passkeys/controllers/sessions_controller_concern.rb

@@ -30,7 +30,7 @@ def new_challenge
         protected
 
         def relying_party
-          raise "need to define relying_party for this SessionsController"
+          raise NoMethodError, "need to define relying_party for this #{self.class.name}"
         end
       end
     end

test/devise/passkeys/controllers/test_sessions_controller_concern.rb

@@ -104,8 +104,8 @@ def resource_name
     Rails.application.reload_routes!
   end
 
-  test "#new_challenge: raises RuntimeError if set_relying_party_in_request_env has not been implemented" do
-    assert_raises RuntimeError do
+  test "#new_challenge: raises RuntimeError if relying_party has not been implemented" do
+    assert_raises NoMethodError do
       post "/session/new_challenge"
     end
   end