Bump omniauth from 1.7.1 to 1.9.0

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.7.1 to 1.9.0.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.7.1...v1.9.0)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -75,7 +75,7 @@ GEM
     ffi (1.12.1)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    hashie (3.5.6)
+    hashie (3.6.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
     jsonapi-renderer (0.2.0)
@@ -94,8 +94,8 @@ GEM
     nio4r (2.3.1)
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
-    omniauth (1.7.1)
-      hashie (>= 3.4.6, < 3.6.0)
+    omniauth (1.9.0)
+      hashie (>= 3.4.6, < 3.7.0)
       rack (>= 1.6.2, < 3)
     orm_adapter (0.5.0)
     pg (0.21.0)