release(turborepo): 2.8.4 (#11769)
## Release v2.8.4
Versioned docs: https://v2-8-4.turborepo.dev
### Changes
- fix: Upgrade semver to fix ReDoS vulnerability (#11765) (`84ff90c5ec`)
- fix: Upgrade tsdown to fix valibot and diff vulnerabilities (#11766)
(`c6902b033b`)
- fix: Add Vary: Accept header to docs markdown endpoint (#11759)
(`c72804631f`)
- fix: Auto-bump to next canary after stable releases (#11761)
(`14f7428234`)
- release(turborepo): 2.8.4-canary.0 (#11763) (`dd4c9c2964`)
- docs: Capitalizaiton in update github-actions.mdx (#11762)
(`07026af786`)
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Co-authored-by: Turbobot <turbobot@vercel.com>