build(deps): bump jekyll from 3.6.2 to 3.6.3 in /docs (#2565)

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.6.2 to 3.6.3.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll/compare/v3.6.2...v3.6.3)

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

docs/Gemfile.lock

@@ -16,12 +16,12 @@ GEM
     commonmarker (0.17.7.1)
       ruby-enum (~> 0.5)
     concurrent-ruby (1.0.5)
-    ethon (0.11.0)
+    ethon (0.12.0)
       ffi (>= 1.3.0)
     execjs (2.7.0)
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.24)
+    ffi (1.11.1)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
     github-pages (172)
@@ -79,7 +79,7 @@ GEM
       nokogiri (>= 1.4)
     i18n (0.9.1)
       concurrent-ruby (~> 1.0)
-    jekyll (3.6.2)
+    jekyll (3.6.3)
       addressable (~> 2.4)
       colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
@@ -126,7 +126,7 @@ GEM
       jekyll (~> 3.3)
     jekyll-remote-theme (0.2.3)
       jekyll (~> 3.5)
-      rubyzip (>= 1.2.2, < 3.0)
+      rubyzip (>= 1.2.1, < 3.0)
       typhoeus (>= 0.7, < 2.0)
     jekyll-sass-converter (1.5.0)
       sass (~> 3.4)
@@ -200,18 +200,18 @@ GEM
       mini_portile2 (~> 2.3.0)
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
-    pathutil (0.16.1)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (2.0.5)
-    rb-fsevent (0.10.2)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rouge (2.2.1)
     ruby-enum (0.7.1)
       i18n
-    rubyzip (1.2.1)
-    safe_yaml (1.0.4)
-    sass (3.5.3)
+    rubyzip (1.2.3)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)