build(deps): bump turbo from 2.8.16 to 2.8.20

Bumps [turbo](https://github.com/vercel/turborepo) from 2.8.16 to 2.8.20.
- [Release notes](https://github.com/vercel/turborepo/releases)
- [Changelog](https://github.com/vercel/turborepo/blob/main/RELEASE.md)
- [Commits](vercel/turborepo@v2.8.16...v2.8.20)

---
updated-dependencies:
- dependency-name: turbo
  dependency-version: 2.8.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -19,7 +19,7 @@ catalogs:
     class-validator: ^0.14.3
   core:
     '@types/node': ^25.5.0
-    turbo: ^2.8.16
+    turbo: ^2.8.21
     typescript: ^5.9.3
   docs:
     typedoc: ^0.28.17