Bump omniauth from 2.1.2 to 2.1.3

Bumps [omniauth](https://github.com/omniauth/omniauth) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v2.1.2...v2.1.3)

---
updated-dependencies:
- dependency-name: omniauth
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -383,7 +383,7 @@ GEM
     octokit (9.2.0)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
-    omniauth (2.1.2)
+    omniauth (2.1.3)
       hashie (>= 3.4.6)
       rack (>= 2.2.3)
       rack-protection