bump the redis gem to 3.3.2
bump the redis gem to 3.3.2

https://github.com/redis/redis-rb/pull/644 might be relevant to some
errors we've been seeing.

refs CNVS-34084

test plan: specs should pass, app should connect to redis

Change-Id: Ibcb58a8ea36390f3a3203eef83142a79f003e3b1
Reviewed-on: https://gerrit.instructure.com/98681
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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