Update jekyll requirement from ~> 3.9.1 to ~> 3.10.0

Updates the requirements on [jekyll](https://github.com/jekyll/jekyll) to permit the latest version.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v3.9.1...v3.10.0)

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

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

Gemfile

@@ -8,7 +8,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 3.9.1"
+gem "jekyll", "~> 3.10.0"
 gem "ffi", "= 1.16.3"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.