Fix deploy script for ethers v6 compatibility

[dev-araujo]

This PR updates the deploy.js script to be compatible with the latest version of ethers.js (v6).

Problem:

When attempting to deploy our HelloWorld contract using npx hardhat run scripts/deploy.js --network sepolia, the script throws the following error:

Deploying Contract...
TypeError: Cannot read properties of undefined (reading 'hash')
at main (/home/dev-araujo/Documents/github/blockchain-projects/meta-school/Hello-World/scripts/deploy.js:22:47)
at processTicksAndRejections (node:internal/process/task_queues:95:5)

Solution

The deploy.js script was using deprecated methods from older versions of ethers.js. This update addresses these issues by migrating to the new API introduced in v6. Specifically:

• ContractFactory.deploy() now directly returns the deployed contract instance. The deployTransaction property is no longer available.
• Replaced provider.waitForTransaction(txHash) with contract.waitForDeployment(), which is the recommended way to wait for deployment confirmation in ethers v6.
• Replaced accessing txReceipt.contractAddress with contract.getAddress(), a new method to get the deployed contract address.
• Removed the use of .hash directly as it is not needed anymore.
• added const { ethers } = require("hardhat"); to make sure that hardhat is correctly imported.

These changes ensure that the script functions correctly with the updated library and avoids potential errors.