Bump gatkeeper to v0.8.7.
Bump gatkeeper to v0.8.7.

apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella,OdiloOrg/api-umbrella-router,NREL/api-umbrella-router,apinf/api-umbrella,NREL/api-umbrella-router,apinf/api-umbrella,NREL/api-umbrella,OdiloOrg/api-umbrella-router,OdiloOrg/api-umbrella-router,NREL/api-umbrella-router