chore(deps): update dependency jekyll-octicons to v19

Author: renovate[bot]

jekyll-build-json/Gemfile

@@ -10,7 +10,7 @@ gem "github-pages", "= 232"
 # It is not directly included in the github-pages gem list of dependencies,
 # even though it is included in the original GitHub Pages build infrastructure.
 gem "jekyll-include-cache", "= 0.2.1"
-gem "jekyll-octicons", "~> 14.2"
+gem "jekyll-octicons", "~> 19.0"
 gem "minima", "~> 2.0"
 
 # Work-around for webrick no longer included in Ruby 3.0 (https://github.com/jekyll/jekyll/issues/8523)