v2.8.11-canary.20

<!-- Release notes generated using configuration in .github/release.yml at v2.8.11-canary.20 -->

What's Changed

Changelog

• perf: Optimize engine builder, task visitor, and untracked file discovery by @anthonyshew in https://github.com/vercel/turborepo/pull/11956
• perf: Parallelize turbo run pre-execution hot path by @anthonyshew in https://github.com/vercel/turborepo/pull/11958

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.11-canary.19...v2.8.11-canary.20