chore: bump node-fetch and @vercel/node

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.9 and updates ancestor dependency [@vercel/node](https://github.com/vercel/vercel/tree/HEAD/packages/node). These dependencies need to be updated together.


Updates `node-fetch` from 2.6.1 to 2.6.9
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.1...v2.6.9)

Updates `@vercel/node` from 2.3.0 to 2.15.10
- [Release notes](https://github.com/vercel/vercel/releases)
- [Changelog](https://github.com/vercel/vercel/blob/main/packages/node/CHANGELOG.md)
- [Commits](https://github.com/vercel/vercel/commits/@vercel/node@2.15.10/packages/node)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-version: 2.6.9
  dependency-type: indirect
- dependency-name: "@vercel/node"
  dependency-version: 2.15.10
  dependency-type: direct:development
...

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Author: dependabot[bot]