Update faucet.mdx (scroll-tech#99)

Added Infura Sepolia faucet

Author: 0xCryptic1

src/content/docs/en/user-guide/faucet.mdx

@@ -20,6 +20,7 @@ Here are a few Sepolia faucet apps:
 - [https://sepolia-faucet.pk910.de](https://sepolia-faucet.pk910.de)
 - [https://faucet.quicknode.com/drip](https://faucet.quicknode.com/drip)
 - [https://faucet.chainstack.com](https://faucet.chainstack.com)
+- [https://infura.io/faucet/sepolia](https://infura.io/faucet/sepolia)
 
 Once you receive ETH on Sepolia, you should see it in your wallet on the _Sepolia Network_. It may take a few seconds for them to appear, but you can check the status by looking for a transaction to your address on a [Sepolia Block Explorer](https://sepolia.etherscan.io/).