Update lessons 2, 3, 4, 5 with new Hardhat, ethers.js versions. And now OZ is using 0.8.20.....

[elPiablo]

Hardhat and ethers.js get significant upgrades with breaking changes for our lessons

That means we need to either rerun the lessons to get the updated code output and update the lessons, or just manually update the code that will now break our present code e.g. .deployed() and .utils() have been changed or retired.

There is also a mention about Network helpers re-export. I'm not 100% sure what that means (without researching it more): import helpers from "@nomicfoundation/hardhat-toolbox/network-helpers";

Check the link for all the details: https://github.com/NomicFoundation/hardhat/releases/tag/%40nomicfoundation%2Fhardhat-toolbox%403.0.0

• [x] fixed Build a Basic NFT lesson
• [x] fixed TierNFT lesson
• [ ] checked need for changes and/or fixed Write Automated Test for Your Smart Contracts lesson
• [ ] checked need for changes and/or fixed Connecting to a Front End lesson

Can we find out about these types of things: https://github.com/NomicFoundation/hardhat/releases/tag/%40nomicfoundation%2Fhardhat-toolbox%403.0.0 in a more predictable way? e.g. I came across a bug, and searched, and then had some luck and found this link. Could we get an alert from somewhere? e.g. to the repo, or is it an idea to have a Breaking changes channel in the DAO?

[elPiablo]

Now OpenZeppelin have upgraded their contracts to solc 0.8.20, so any imported contracts from them into ours are going to break. So we need to upgrade ours all to 0.8.20 as well......