kiji-mapreduce: KIJIMR-271.  Update schema dependency to 1.4.1.

Needed for refactoring of schema.impl to schema.impl.hbase in
SCHEMA-693.

review: https://review.kiji.org/r/1784
issue: https://jira.kiji.org/KIJIMR-271
commit: https://github.com/kijiproject/kiji-mapreduce/commit/acc5ad87020a39f582c68e1af8a2e6aa797e671c