bump k5uploader to v0.0.3

to get case insensitive file extension fix

fixes NTRS-608

Change-Id: I7a4f3fa4fb80c24b32e211c197dde844a7117c7d
Reviewed-on: https://gerrit.instructure.com/37047
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
QA-Review: David Josse <david@instructure.com>
Product-Review: Paul Hinze <paulh@instructure.com>