Bump @scalar/fastify-api-reference from 1.67.0 to 1.68.0 (#293)

Bumps [@scalar/fastify-api-reference](https://github.com/scalar/scalar/tree/HEAD/integrations/fastify) from 1.67.0 to 1.68.0.
- [Release notes](https://github.com/scalar/scalar/releases)
- [Changelog](https://github.com/scalar/scalar/blob/main/integrations/fastify/CHANGELOG.md)
- [Commits](https://github.com/scalar/scalar/commits/HEAD/integrations/fastify)

---
updated-dependencies:
- dependency-name: "@scalar/fastify-api-reference"
  dependency-version: 1.68.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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