Bump omniauth-github from 1.4.0 to 2.0.0

Bumps [omniauth-github](https://github.com/intridea/omniauth-github) from 1.4.0 to 2.0.0.
- [Release notes](https://github.com/intridea/omniauth-github/releases)
- [Commits](omniauth/omniauth-github@v1.4.0...v2.0.0)

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

Author: dependabot[bot]

Gemfile.lock

@@ -236,7 +236,6 @@ GEM
     mini_mime (1.1.2)
     mini_portile2 (2.8.0)
     minitest (5.16.2)
-    multi_json (1.15.0)
     multi_xml (0.6.0)
     nenv (0.3.0)
     nested_form (0.3.2)
@@ -247,21 +246,23 @@ GEM
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    oauth2 (1.4.9)
+    oauth2 (2.0.5)
       faraday (>= 0.17.3, < 3.0)
       jwt (>= 1.0, < 3.0)
-      multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
+      rash_alt (>= 0.4, < 1)
+      version_gem (~> 1.1)
     octokit (4.25.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
-    omniauth (1.9.1)
+    omniauth (2.1.0)
       hashie (>= 3.4.6)
-      rack (>= 1.6.2, < 3)
-    omniauth-github (1.4.0)
-      omniauth (~> 1.5)
-      omniauth-oauth2 (>= 1.4.0, < 2.0)
+      rack (>= 2.2.3)
+      rack-protection
+    omniauth-github (2.0.0)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
     omniauth-oauth2 (1.7.3)
       oauth2 (>= 1.4, < 3)
       omniauth (>= 1.9, < 3)
@@ -287,6 +288,8 @@ GEM
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)
+    rack-protection (2.2.0)
+      rack
     rack-test (2.0.2)
       rack (>= 1.3)
     rails (6.1.6)
@@ -329,6 +332,8 @@ GEM
       thor (~> 1.0)
     rainbow (3.1.1)
     rake (13.0.6)
+    rash_alt (0.4.12)
+      hashie (>= 3.4)
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -450,6 +455,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     unicode-display_width (2.2.0)
     vcr (6.1.0)
+    version_gem (1.1.0)
     warden (1.2.9)
       rack (>= 2.0.9)
     web-console (4.2.0)