Bump nokogiri from 1.13.6 to 1.15.6#18

dependabot[bot] wants to merge 1 commit intomasterJavaChat/JavaChat.github.io:masterfrom

dependabot/bundler/nokogiri-1.15.6JavaChat/JavaChat.github.io:dependabot/bundler/nokogiri-1.15.6Copy head branch name to clipboard