Makefile: Update bots target for moved GitHub project
Makefile: Update bots target for moved GitHub project

Cockpit bots are in their own project now.

Make the target phony so that `make bots` updates an existing checkout.

weldr/welder-web,weldr/welder-web,jkozol/welder-web,jkozol/welder-web,jkozol/welder-web,weldr/welder-web,jkozol/welder-web,weldr/welder-web