Bump node-fetch and @stoplight/spectral

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.7 and updates ancestor dependency [@stoplight/spectral](https://github.com/stoplightio/spectral). These dependencies need to be updated together.


Updates `node-fetch` from 2.6.1 to 2.6.7
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.1...v2.6.7)

Updates `@stoplight/spectral` from 5.9.2 to 6.5.0
- [Release notes](https://github.com/stoplightio/spectral/releases)
- [Changelog](https://github.com/stoplightio/spectral/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/stoplightio/spectral/compare/v5.9.2...@stoplight/spectral-cli-v6.5.0)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: "@stoplight/spectral"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]