build(deps): bump omniauth from 2.1.1 to 2.1.2

Bumps [omniauth](https://github.com/omniauth/omniauth) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v2.1.1...v2.1.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -72,7 +72,7 @@ GEM
     octokit (8.0.0)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
-    omniauth (2.1.1)
+    omniauth (2.1.2)
       hashie (>= 3.4.6)
       rack (>= 2.2.3)
       rack-protection