Bump omniauth from 1.9.2 to 2.0.0

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.9.2 to 2.0.0.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.9.2...v2.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -66,7 +66,7 @@ gem 'bcrypt'
 gem 'doorkeeper'
 
 # OAuth clients
-gem 'omniauth', '~> 1.9'
+gem 'omniauth', '~> 2.0'
 gem 'omniauth-identity'
 gem 'omniauth-facebook'
 gem 'omniauth-twitter'

Gemfile.lock

@@ -491,17 +491,18 @@ GEM
       bigdecimal (>= 3.0)
       ostruct (>= 0.2)
     oj_mimic_json (1.0.1)
-    omniauth (1.9.2)
+    omniauth (2.0.0)
       hashie (>= 3.4.6)
       rack (>= 1.6.2, < 3)
+      rack-protection
     omniauth-facebook (10.0.0)
       bigdecimal
       omniauth-oauth2 (>= 1.2, < 3)
-    omniauth-google-oauth2 (0.8.2)
+    omniauth-google-oauth2 (1.0.1)
       jwt (>= 2.0)
       oauth2 (~> 1.1)
-      omniauth (~> 1.1)
-      omniauth-oauth2 (>= 1.6)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
     omniauth-identity (3.0.9)
       bcrypt
       omniauth
@@ -582,6 +583,9 @@ GEM
       rack (< 4)
     rack-cors (2.0.2)
       rack (>= 2.0.0)
+    rack-protection (3.2.0)
+      base64 (>= 0.1.0)
+      rack (~> 2.2, >= 2.2.4)
     rack-session (1.0.2)
       rack (< 3)
     rack-test (2.1.0)
@@ -877,7 +881,7 @@ DEPENDENCIES
   mini_racer
   oj
   oj_mimic_json
-  omniauth (~> 1.9)
+  omniauth (~> 2.0)
   omniauth-facebook
   omniauth-google-oauth2
   omniauth-identity