installation: upper pin on apispecs
installation: upper pin on apispecs

* Fixes `master` branch docker image building troubles by restricting upper
  version of apispec dependency.

Signed-off-by: Tibor Simko <c7116e45300b163846dc01f3ed02116e3f8ef7a5@cern.ch>

reanahub/reana-job-controller,diegodelemos/reana-job-controller,tiborsimko/reana-job-controller,tiborsimko/reana-job-controller,diegodelemos/reana-job-controller,reanahub/reana-job-controller