Update syntax-highlight to latest version

Julien LepillerTue Aug 24 23:16:23+0200 2021

73e93db

gitile/assets/css
namelast commitdate
git.cssDark theme and improved markdown styleTue Aug 10 14:45:45+0200 2021
gitile.cssDark theme and improved markdown styleTue Aug 10 14:45:45+0200 2021
highlight.cssSupport shell and autoconf highlightingMon Jun 28 01:52:43+0200 2021