Merge branch 'update-omniauth' into 'master'

Update omniauth 1.4.2 -> 1.8

See merge request gitlab-org/gitlab-ce!17763

Gemfile

@@ -37,7 +37,7 @@ gem 'faraday', '~> 0.12'
 gem 'devise', '~> 4.2'
 gem 'doorkeeper', '~> 4.3'
 gem 'doorkeeper-openid_connect', '~> 1.3'
-gem 'omniauth', '~> 1.4.2'
+gem 'omniauth', '~> 1.8'
 gem 'omniauth-auth0', '~> 1.4.1'
 gem 'omniauth-azure-oauth2', '~> 0.0.9'
 gem 'omniauth-cas3', '~> 1.1.4'

Gemfile.lock

@@ -524,8 +524,8 @@ GEM
       rack (>= 1.2, < 3)
     octokit (4.8.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    omniauth (1.4.3)
-      hashie (>= 1.2, < 4)
+    omniauth (1.8.1)
+      hashie (>= 3.4.6, < 3.6.0)
       rack (>= 1.6.2, < 3)
     omniauth-auth0 (1.4.1)
       omniauth-oauth2 (~> 1.1)
@@ -1104,7 +1104,7 @@ DEPENDENCIES
   nokogiri (~> 1.8.2)
   oauth2 (~> 1.4)
   octokit (~> 4.8)
-  omniauth (~> 1.4.2)
+  omniauth (~> 1.8)
   omniauth-auth0 (~> 1.4.1)
   omniauth-authentiq (~> 0.3.1)
   omniauth-azure-oauth2 (~> 0.0.9)