v2.8.11-canary.26

<!-- Release notes generated using configuration in .github/release.yml at v2.8.11-canary.26 -->

What's Changed

Changelog

• perf: Parallelize task hash computation across topological waves by @anthonyshew in https://github.com/vercel/turborepo/pull/11969
• perf: Send engine callback before tracker bookkeeping and add tracing spans by @anthonyshew in https://github.com/vercel/turborepo/pull/11970

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.11-canary.24...v2.8.11-canary.26