Bump node-fetch and ethereum-waffle

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.12 and updates ancestor dependency [ethereum-waffle](https://github.com/EthWorks/Waffle). These dependencies need to be updated together.


Updates `node-fetch` from 1.7.3 to 2.6.12
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@1.7.3...v2.6.12)

Updates `ethereum-waffle` from 3.4.4 to 4.0.10
- [Release notes](https://github.com/EthWorks/Waffle/releases)
- [Commits](https://github.com/EthWorks/Waffle/compare/[email protected]@4.0.10)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: ethereum-waffle
  dependency-type: direct:development
...

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