biliass@2.4.0

What's Changed

• ⚡ perf(biliass): optimize biliass hot-path allocations by @SigureMo in #658
• 🐛 fix(biliass): add trailing & to \alpha override tag in ASS output by @Copilot in #659

Full Changelog: https://github.com/yutto-dev/yutto/compare/biliass@2.3.1...biliass@2.4.0