spec: increase rubocop allowed rspec nested groups
spec: increase rubocop allowed rspec nested groups

Change-Id: Ice28cad151efa8f58e45b88eb3b11ac248d07c7b
Reviewed-on: https://gerrit.instructure.com/100104
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Jenkins
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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