[SPARK-18809] KCL version to 1.6.2 on master

## What changes were proposed in this pull request?

Upgrading KCL version from 1.6.1 to 1.6.2.  Without this upgrade, Spark cannot consume
from a stream that includes aggregated records.

This change was already commited against an older version of Spark.  We need to
apply the same thing to master.

## How was this patch tested?

Manual testing using dump.py:
https://gist.github.com/boneill42/020dde814346c6b4ad0ba28406c3ea10

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Brian O'Neill <bone@alumni.brown.edu>

Closes #16236 from boneill42/master.