Bump octokit from 4.19.0 to 4.20.0 (#12057)

Bumps [octokit](https://github.com/octokit/octokit.rb) from 4.19.0 to 4.20.0.
- [Release notes](https://github.com/octokit/octokit.rb/releases)
- [Changelog](https://github.com/octokit/octokit.rb/blob/4-stable/RELEASE.md)
- [Commits](https://github.com/octokit/octokit.rb/compare/v4.19.0...v4.20.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -58,7 +58,7 @@ gem "katex", "~> 0.6.0" # This rubygem enables you to render TeX math to HTML us
 gem "liquid", "~> 4.0" # A secure, non-evaling end user template engine with aesthetic markup
 gem "mini_racer", "~> 0.3.1" # Minimal embedded v8
 gem "nokogiri", "~> 1.10" # HTML, XML, SAX, and Reader parser
-gem "octokit", "~> 4.19" # Simple wrapper for the GitHub API
+gem "octokit", "~> 4.20" # Simple wrapper for the GitHub API
 gem "oj", "~> 3.10" # JSON parser and object serializer
 gem "omniauth", "~> 1.9" # A generalized Rack framework for multiple-provider authentication
 gem "omniauth-apple", "~> 1.0" # OmniAuth strategy for Sign In with Apple

Gemfile.lock

@@ -271,7 +271,7 @@ GEM
       railties (>= 5.0.0)
     faker (2.15.1)
       i18n (>= 1.6, < 2)
-    faraday (1.1.0)
+    faraday (1.2.0)
       multipart-post (>= 1.2, < 3)
       ruby2_keywords
     faraday_middleware (1.0.0)
@@ -474,7 +474,7 @@ GEM
       multi_json (~> 1.3)
       multi_xml (~> 0.5)
       rack (>= 1.2, < 3)
-    octokit (4.19.0)
+    octokit (4.20.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     oj (3.10.18)
@@ -899,7 +899,7 @@ DEPENDENCIES
   mini_racer (~> 0.3.1)
   nakayoshi_fork (~> 0.0.4)
   nokogiri (~> 1.10)
-  octokit (~> 4.19)
+  octokit (~> 4.20)
   oj (~> 3.10)
   omniauth (~> 1.9)
   omniauth-apple (~> 1.0)