Updated Google Omniauth gem

Description

This updates the Google OAuth gem to the latest version, which resolves us using Google Plus APIs, which are now deprecated. I don't know how to check if it's using the right API, but I trust that the developers of the omniauth gem fixed the issue.

Resolves #404.

Type of Pull Request

Based on the contributor's guide, this PR is of type:

[x] Development (feature-branch -> dev)
[ ] Hotfix (hotfix-branch -> master)
[ ] Release (release-branch -> master)
[ ] Other

Requestor Checklist

Requestor: Put an x in all that apply. You can check boxes after the PR has been made.

Reviewer: If you see an item that is not checked that you believe should be, comment on that as part of your review.

[ ] Code Quality: I have written tests to ensure that my changes work and handle edge cases
[ ] Code Quality: I have documented my changes thoroughly (using JSDoc in Javascript)
[x] Process: I have linked relevant issues, marking issues that this PR resolves
[x] Process: I have requested at least as many reviews required for this PR type (2 or 3)
[x] Process: I have added this PR to the relevant quarterly milestone
[x] Process: I have tested this PR locally and verified it does what it should

How This Has Been Tested

Tested by signing in with Google locally.

vkoves / carpe