build(deps-dev): bump node-fetch and @types/node-fetch (#694)

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) and [@types/node-fetch](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node-fetch). These dependencies needed to be updated together.

Updates `node-fetch` from 2.6.11 to 2.7.0
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.11...v2.7.0)

Updates `@types/node-fetch` from 2.6.2 to 2.6.8
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node-fetch)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:development
  update-type: version-update:semver-minor
- dependency-name: "@types/node-fetch"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>