Adds arrity to http-out-requests helper to accept filter functions

Adds arrity to [http-out-requests](https://github.com/parenthesin/microservice-boilerplate/blob/main/test/integration/parenthesin/util/http.clj#L14) helper to accept filter functions
```clojure
(defn http-out-requests
  ([]
   (http-out-requests identity))
  ([afn]
   (flow "retrieves http request"
     (state-flow.api/get-state (comp afn deref :requests :http)))))
```