Bump omniauth from 1.8.1 to 1.9.0 (#9544)

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](https://github.com/omniauth/omniauth/compare/v1.8.1...v1.9.0)

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

Gemfile

@@ -40,7 +40,7 @@ end
 gem 'net-ldap', '~> 0.10'
 gem 'omniauth-cas', '~> 1.1'
 gem 'omniauth-saml', '~> 1.10'
-gem 'omniauth', '~> 1.2'
+gem 'omniauth', '~> 1.9'
 
 gem 'doorkeeper', '~> 5.0'
 gem 'fast_blank', '~> 1.0'

Gemfile.lock

@@ -251,7 +251,7 @@ GEM
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
     hashdiff (0.3.7)
-    hashie (3.5.7)
+    hashie (3.6.0)
     heapy (0.1.4)
     highline (2.0.0)
     hiredis (0.6.3)
@@ -364,8 +364,8 @@ GEM
       sidekiq (>= 3.5.0)
       statsd-ruby (~> 1.2.0)
     oj (3.7.4)
-    omniauth (1.8.1)
-      hashie (>= 3.4.6, < 3.6.0)
+    omniauth (1.9.0)
+      hashie (>= 3.4.6, < 3.7.0)
       rack (>= 1.6.2, < 3)
     omniauth-cas (1.1.1)
       addressable (~> 2.3)
@@ -712,7 +712,7 @@ DEPENDENCIES
   nokogiri (~> 1.8)
   nsa (~> 0.2)
   oj (~> 3.7)
-  omniauth (~> 1.2)
+  omniauth (~> 1.9)
   omniauth-cas (~> 1.1)
   omniauth-saml (~> 1.10)
   ostatus2 (~> 2.0)