v2.8.21-canary.12

<!-- Release notes generated using configuration in .github/release.yml at v2.8.21-canary.12 -->

What's Changed

Changelog

• fix: Resolve turbo watch hang with mixed interruptible persistent tasks by @anthonyshew in https://github.com/vercel/turborepo/pull/12449

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.21-canary.11...v2.8.21-canary.12