Bump omniauth-github and omniauth

Bumps [omniauth-github](https://github.com/intridea/omniauth-github) and [omniauth](https://github.com/omniauth/omniauth). These dependencies needed to be updated together.

Updates `omniauth-github` from 1.4.0 to 2.0.1
- [Release notes](https://github.com/intridea/omniauth-github/releases)
- [Commits](omniauth/omniauth-github@v1.4.0...v2.0.1)

Updates `omniauth` from 1.9.2 to 2.1.2
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](omniauth/omniauth@v1.9.2...v2.1.2)

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

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

Gemfile.lock

@@ -174,9 +174,29 @@ GEM
     factory_bot_rails (6.1.0)
       factory_bot (~> 6.1.0)
       railties (>= 5.0.0)
-    faraday (1.1.0)
-      multipart-post (>= 1.2, < 3)
-      ruby2_keywords
+    faraday (1.10.3)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
+      faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0)
+      faraday-multipart (~> 1.0)
+      faraday-net_http (~> 1.0)
+      faraday-net_http_persistent (~> 1.0)
+      faraday-patron (~> 1.0)
+      faraday-rack (~> 1.0)
+      faraday-retry (~> 1.0)
+      ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
+    faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-multipart (1.0.4)
+      multipart-post (~> 2)
+    faraday-net_http (1.0.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    faraday-rack (1.0.0)
+    faraday-retry (1.0.3)
     ffi (1.16.3)
     ffi-compiler (1.3.2)
       ffi (>= 1.15.5)
@@ -272,7 +292,7 @@ GEM
     msgpack (1.7.2)
     multi_json (1.15.0)
     multi_xml (0.6.0)
-    multipart-post (2.1.1)
+    multipart-post (2.4.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     neat (1.9.1)
@@ -308,15 +328,16 @@ GEM
     octokit (4.19.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    omniauth (1.9.2)
+    omniauth (2.1.2)
       hashie (>= 3.4.6)
-      rack (>= 1.6.2, < 3)
-    omniauth-github (1.4.0)
-      omniauth (~> 1.5)
-      omniauth-oauth2 (>= 1.4.0, < 2.0)
-    omniauth-oauth2 (1.7.3)
+      rack (>= 2.2.3)
+      rack-protection
+    omniauth-github (2.0.1)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.8)
+    omniauth-oauth2 (1.8.0)
       oauth2 (>= 1.4, < 3)
-      omniauth (>= 1.9, < 3)
+      omniauth (~> 2.0)
     paperclip (6.1.0)
       activemodel (>= 4.2.0)
       activesupport (>= 4.2.0)