Bump jekyll from 3.8.3 to 3.8.4 in /app#3

dependabot[bot] wants to merge 1 commit intomasterlinkmalloc/www:masterfrom

dependabot/bundler/app/jekyll-3.8.4linkmalloc/www:dependabot/bundler/app/jekyll-3.8.4Copy head branch name to clipboard