Require active_support in pact helper

As per rails/rails#52582, one must `require
active_support` before requiring any other definition(s) like
`active_support/core_ext/module/delegation`, which is included by
`factory_bot_rails`.

Therefore requiring `active_support` here, until
thoughtbot/factory_bot#1685 is resolved.

(Thanks to @brucebolt)

spec/service_consumer/pact_helper.rb

@@ -1,5 +1,6 @@
 ENV["PACT_DO_NOT_TRACK"] = "true"
 
+require "active_support"
 require "pact/provider/rspec"
 require "webmock/rspec"
 require "factory_bot_rails"