Update eventmachine gem version
Update eventmachine gem version

The updated eventmachine gem will no longer fail to install when
running "bundle _1.11.2_ install". See also
https://github.com/eventmachine/eventmachine/pull/668

Change-Id: Ia982dfaf5717c1956daa348f3f972baba4440b69
Reviewed-on: https://gerrit.instructure.com/90482
Reviewed-by: August Thornton <9adc7a1161ddf32ff608de792a7e50179545f026@instructure.com>
Tested-by: Jenkins
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Product-Review: Taylor Wilson <0ef9166ffb07b98b817ea7d6bbe447ae88189dfd@instructure.com>
QA-Review: Taylor Wilson <0ef9166ffb07b98b817ea7d6bbe447ae88189dfd@instructure.com>

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