Bump node-fetch from 2.3.0 to 2.6.7 in /nfl/api

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.3.0 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.3.0...v2.6.7)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]