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

@@ -271,12 +271,13 @@ GEM
     octokit (4.21.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    omniauth (1.9.1)
+    omniauth (2.0.4)
       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-protection
+    omniauth-github (2.0.0)
+      omniauth (~> 2.0)
+      omniauth-oauth2 (~> 1.7.1)
     omniauth-oauth2 (1.7.2)
       oauth2 (~> 1.4)
       omniauth (>= 1.9, < 3)
@@ -302,6 +303,8 @@ GEM
     rack-pjax (1.1.0)
       nokogiri (~> 1.5)
       rack (>= 1.1)
+    rack-protection (2.1.0)
+      rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (6.1.4.1)