Bump omniauth from 1.9.1 to 1.9.2 (#822)

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.9.1 to 1.9.2.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.9.1...v1.9.2)

---
updated-dependencies:
- dependency-name: omniauth
  dependency-type: direct:production
...

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Gemfile.lock

@@ -207,7 +207,7 @@ GEM
       request_store (>= 1.0)
     groupdate (5.0.0)
       activesupport (>= 5)
-    hashie (4.1.0)
+    hashie (5.0.0)
     heapy (0.1.4)
     http-accept (1.7.0)
     http-cookie (1.0.3)
@@ -289,7 +289,7 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     oj (3.10.6)
-    omniauth (1.9.1)
+    omniauth (1.9.2)
       hashie (>= 3.4.6)
       rack (>= 1.6.2, < 3)
     omniauth-google-oauth2 (0.8.0)
@@ -322,7 +322,7 @@ GEM
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.4)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
     rack-mini-profiler (2.0.2)