Bump node-fetch and @truffle/hdwallet-provider

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) and [@truffle/hdwallet-provider](https://github.com/trufflesuite/truffle/tree/HEAD/packages/hdwallet-provider). These dependencies needed to be updated together.

Updates `node-fetch` from 1.7.3 to 2.6.11
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@1.7.3...v2.6.11)

Updates `@truffle/hdwallet-provider` from 1.7.0 to 2.1.12
- [Release notes](https://github.com/trufflesuite/truffle/releases)
- [Commits](https://github.com/trufflesuite/truffle/commits/@truffle/hdwallet-provider@2.1.12/packages/hdwallet-provider)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: "@truffle/hdwallet-provider"
  dependency-type: indirect
...

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