Update hardhat.md

added Node version recommendation in pre-reqs so it's more prominent

Author: ottovlotto

develop/smart-contracts/dev-environments/hardhat.md

@@ -31,6 +31,7 @@ Hardhat is a robust development environment for Ethereum-compatible chains that
 Before getting started, ensure you have:
 
 - [Node.js](https://nodejs.org/){target=\_blank} (v16.0.0 or later) and npm installed.
+  - Note: Consider using Node.js 22.18+ and npm version 10.9.0+ to avoid issues with the Polkadot plugin.
 - Basic understanding of Solidity programming.
 - Some PAS test tokens to cover transaction fees (easily obtainable from the [Polkadot faucet](https://faucet.polkadot.io/?parachain=1111){target=\_blank}). To learn how to get test tokens, check out the [Test Tokens](/develop/smart-contracts/connect-to-polkadot#test-tokens){target=\_blank} section.