Bump jekyll from 3.1.6 to 3.6.3 in /bootstrap

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.1.6 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/v3.1.6...v3.6.3)

---
updated-dependencies:
- dependency-name: jekyll
  dependency-type: direct:development
...

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

bootstrap/Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.1.2'
+  gem 'jekyll', '~> 3.6.3'
   gem 'jekyll-sitemap', '~> 0.11.0'
 end

bootstrap/Gemfile.lock

@@ -2,43 +2,52 @@ GEM
   remote: https://rubygems.org/
   specs:
     addressable (2.4.0)
-    colorator (0.1)
+    colorator (1.1.0)
     ffi (1.15.4)
     ffi (1.15.4-x64-mingw32)
-    jekyll (3.1.6)
-      colorator (~> 0.1)
+    forwardable-extended (2.6.0)
+    jekyll (3.6.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      rouge (~> 1.7)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 3)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.4.0)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-sitemap (0.11.0)
       addressable (~> 2.4.0)
-    jekyll-watch (1.4.0)
-      listen (~> 3.0, < 3.1)
-    kramdown (1.11.1)
-    liquid (3.0.6)
-    listen (3.0.8)
+    jekyll-watch (1.5.1)
+      listen (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.3)
+    listen (3.7.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    mercenary (0.3.6)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rouge (2.2.1)
+    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)
       rb-inotify (~> 0.9, >= 0.9.7)
-    mercenary (0.3.6)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
-    rouge (1.11.1)
-    safe_yaml (1.0.4)
-    sass (3.4.22)
 
 PLATFORMS
   ruby
   x64-mingw32
 
 DEPENDENCIES
-  jekyll (~> 3.1.2)
+  jekyll (~> 3.6.3)
   jekyll-sitemap (~> 0.11.0)
 
 BUNDLED WITH