Bump github-pages from 204 to 207

[dependabot-preview[bot]]

Bumps github-pages from 204 to 207.

Release notes

Sourced from github-pages's releases.

v207

Bump jekyll to v3.9.0, kramdown to v2.3.0 (#704) Also, update CI to use Ruby 2.5 and greater.

v206

Bump rouge to v3.19.0 #690

v205

• Bump jekyll to v3.8.7 #689
  • Upgrade Ruby to 2.5.8
  • Upgrade rubocop-github to 0.16.0
  • Stop testing on Ruby 2.3 and 2.4

Commits

• 1cb8d3b Bump :gem: to v207
• f8d7345 Merge pull request #704 from github/hubot/jekyll-v3-9-0
• 044a9e1 Add test to ensure TeX is properly converted by kramdown
• aaf0227 Upgrade to kramdown v2 and add kramdown-parser-gfm to allow GFM input
• 597b140 Update jekyll to :gem: v3.9.0
• 3716171 Merge pull request #703 from github/ruby-2-7
• 3912f66 Hard skip the gem install bundler for all cases
• c8d3907 Only gem install bundler if running Ruby 2.5 or below
• 842eed4 Use the latest RubyGems version in Docker
• 6e2f2ab Upgrade to Ruby 2.7
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #178.