build(deps): bump omniauth from 1.9.1 to 2.1.0

Bumps [omniauth](https://github.com/omniauth/omniauth) from 1.9.1 to 2.1.0.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.9.1...v2.1.0)

---
updated-dependencies:
- dependency-name: omniauth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -213,10 +213,10 @@ GEM
       railties (>= 5.0.0)
     faker (2.20.0)
       i18n (>= 1.8.11, < 2)
-    faraday (2.2.0)
+    faraday (2.3.0)
       faraday-net_http (~> 2.0)
       ruby2_keywords (>= 0.0.4)
-    faraday-net_http (2.0.1)
+    faraday-net_http (2.0.2)
     ffi (1.15.5)
     ffi (1.15.5-x64-mingw32)
     ffi-compiler (1.0.1)
@@ -366,19 +366,20 @@ GEM
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
     oj (3.13.11)
-    omniauth (1.9.1)
+    omniauth (2.1.0)
       hashie (>= 3.4.6)
-      rack (>= 1.6.2, < 3)
+      rack (>= 2.2.3)
+      rack-protection
     omniauth-facebook (9.0.0)
       omniauth-oauth2 (~> 1.2)
-    omniauth-github (1.4.0)
-      omniauth (~> 1.5)
-      omniauth-oauth2 (>= 1.4.0, < 2.0)
-    omniauth-google-oauth2 (0.8.2)
+    omniauth-github (2.0.0)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
+    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-microsoft-office365 (0.0.8)
       omniauth
       omniauth-oauth2