v2.8.15-canary.13

<!-- Release notes generated using configuration in .github/release.yml at v2.8.15-canary.13 -->

What's Changed

Changelog

• perf: Generate cache restore manifest at save time to eliminate first-hit penalty by @anthonyshew in https://github.com/vercel/turborepo/pull/12213

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.15-canary.12...v2.8.15-canary.13