v2.8.13-canary.16

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed

Changelog

• fix: Microfrontends merges with into root config instead of replacing it by @anthonyshew in https://github.com/vercel/turborepo/pull/12125
• fix: Omit None otel fields during turbo prune serialization by @bkonkle in https://github.com/vercel/turborepo/pull/12126

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.13-canary.15...v2.8.13-canary.16