Update hardhat.md

Hey team, this only works with v22 or up (I double checked with Beto who wrote the plugin) so can we quickly update this as some low-hanging fruit here? :) :)

Author: ottovlotto

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

@@ -30,7 +30,7 @@ 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.
+- [Node.js](https://nodejs.org/){target=\_blank} (v22.0.0 or later) and npm installed.
 - 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.