v2.8.21-canary.3

<!-- Release notes generated using configuration in .github/release.yml at v2.8.21-canary.3 -->

What's Changed

eslint

• fix(eslint-plugin-turbo): Guard against missing tasks/pipeline in forEachTaskDef by @sleitor in https://github.com/vercel/turborepo/pull/12411

Changelog

• chore: Deprecate the turbo scan command by @anthonyshew in https://github.com/vercel/turborepo/pull/12406

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.21-canary.2...v2.8.21-canary.3