LibSass has been abandoned in favor of Dart Sass: https://sass-lang.com/libsass/ Switching the Debian CI job to that should be a matter of installing Jekyll via Ruby's Bundler instead of apt. See also https://github.com/bitcoin-core/bitcoincore.org/pull/1246#issuecomment-4421729321.
LibSass has been abandoned in favor of Dart Sass: https://sass-lang.com/libsass/
Switching the Debian CI job to that should be a matter of installing Jekyll via Ruby's Bundler instead of apt.
See also #1246 (comment).