Downgrade omniauth version for compatibility with Emory IDP

Emory and DCE have both experienced issues attempting to run
omniauth 2.0.0 against Emory's Shibboleth infrastructure.

This change downgrades the gem version to a compatible release.

Gemfile

@@ -34,8 +34,8 @@ gem 'mail', '2.6.6.rc1'
 gem 'net-sftp'
 gem 'nokogiri', '>= 1.10.4'
 gem 'okcomputer'
-gem 'omniauth', '< 3.0.0'
-gem 'omniauth-rails_csrf_protection'
+gem 'omniauth', '< 2.0.0'
+# gem 'omniauth-rails_csrf_protection'
 gem 'omniauth-shibboleth', '~> 1.3'
 gem 'pg', '~> 1.0'
 gem 'rack', '>= 2.1.4'

Gemfile.lock

@@ -662,13 +662,9 @@ GEM
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     okcomputer (1.18.4)
-    omniauth (2.0.0)
+    omniauth (1.9.2)
       hashie (>= 3.4.6)
       rack (>= 1.6.2, < 3)
-      rack-protection
-    omniauth-rails_csrf_protection (1.0.1)
-      actionpack (>= 4.2)
-      omniauth (~> 2.0)
     omniauth-shibboleth (1.3.0)
       omniauth (>= 1.0.0)
     openseadragon (0.6.0)
@@ -704,8 +700,6 @@ GEM
       rdf
     racc (1.6.2)
     rack (2.2.6.3)
-    rack-protection (3.0.5)
-      rack
     rack-proxy (0.6.5)
       rack
     rack-test (2.0.2)
@@ -1087,8 +1081,7 @@ DEPENDENCIES
   net-sftp
   nokogiri (>= 1.10.4)
   okcomputer
-  omniauth (< 3.0.0)
-  omniauth-rails_csrf_protection
+  omniauth (< 2.0.0)
   omniauth-shibboleth (~> 1.3)
   parallel
   pg (~> 1.0)