spec: upgrade gergich to 0.2.2
spec: upgrade gergich to 0.2.2

Gergich was updated with a fix for dev branches, which include
forward slashes in their branch names. This allows Canvas dev
branches to build successfully again.

test plan:
* ensure Jenkins passes

Change-Id: I65f8a8c7803bc754e37fcb3e565846956418fe66
Reviewed-on: https://gerrit.instructure.com/133309
Tested-by: Jenkins
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
Product-Review: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>
QA-Review: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>

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