BAU: Fix timezone issue

Verify frontend is comparing notOnOrAfter field (assertion_expiry)
against the current system clock. The clock can be in different timezone
e.g. British Summer Time (GMT+0100). According to SAML specification,
notOnOrAfter specifies the time instant at which the assertion has
expired. The time value is encoded in UTC. This commit updates verify
frontend to compare notOnOrAfter field against the system clock in UTC.
This will prevent users from getting session timeout errors.

Author: @adityapahuja

app/controllers/further_information_controller.rb

@@ -52,6 +52,6 @@ def submit_null_attribute
 private
 
   def expired?
-    !session[:assertion_expiry].nil? && Time.parse(session[:assertion_expiry]) <= Time.now
+    !session[:assertion_expiry].nil? && Time.parse(session[:assertion_expiry]) <= Time.now.utc
   end
 end