Bump keruald/broker version to 0.4.1

Summary: This allows us get the T782 fix introduced in rKBROKER2c8b2ad5cce9.

Test Plan:
A notification has been fired using 0.4.1
(and so the new package name).

Reviewers: dereckson

Differential Revision: http://devcentral.nasqueron.org/D340