Fix old dependencies causing 404 errors on initial install

[ottodevs]

Some issues during initial yarn install

I investigated the issues preventing yarn install to complete:

1. Related to old @graphprotocol/graph-cli depending on github.com/hugomrdias/concat-stream that does not exist anymore.
2. Related to "@nomiclabs/hardhat-ethers": "npm:hardhat-deploy-ethers", that does not found the package.

Solution adopted

• Bump both dependencies to latest versions

Observations

• I only checked this challenge-2 branch, but probably may affect other branches

• The solution is just a patch, a most robust fix would be to update scaffold-eth upstream versions

• Not tested since there are no tests, but with this solution it is possible to at least complete challenge-2 that was broken for several weeks/months

Fixes #323