update Band from Alfajores to Sepolia (#2011)

Author: GigaHierz

docs/developer/oracles/band-protocol.md

@@ -23,11 +23,11 @@ This tutorial will go over:
 2. Compile the contract with compiler version `0.6.11`.
 3. Switch to the Deploy tab of Remix.
    1. Select "Injected Web3" in the Environment dropdown in the top left to connect Metamask.
-   2. Make sure that Metamask is connected to the Alfajores test network. You can read about adding Alfajores to Metamask [here](/wallet/metamask/setup#adding-a-celo-network-to-metamask).
+   2. Make sure that Metamask is connected to the Sepolia test network. You can read about adding Sepolia to Metamask [here](/wallet/metamask/setup#adding-a-celo-network-to-metamask).
 
 <ImageWrapper path="/img/doc-images/band-protocol-how-to/remix-environment.png" alt="environment" width="400" />
 
-4. Enter the Alfajores testnet Band reference data aggregator contract address [`0x3d00deA966314E47aC3D4ACd2f00121351Cec1C5`](https://docs.bandchain.org/develop/supported-blockchains/#testnets) to the `DemoOracle` constructor and deploy the contract. You can access the reference data aggregator contract on Mainnet at [`0xDA7a001b254CD22e46d3eAB04d937489c93174C3`](https://docs.bandchain.org/develop/supported-blockchains/#mainnets). Make sure you check the **current address** on their page, as it might happen that they updated their reference contract and then your Oracle data will not be correct anymore. 
+1. Enter the Sepolia testnet Band reference data aggregator contract address [`0x8c064bCf7C0DA3B3b090BAbFE8f3323534D84d68`](https://docs.bandchain.org/develop/supported-blockchains/#testnets) to the `DemoOracle` constructor and deploy the contract. You can access the reference data aggregator contract on Mainnet at [`0xDA7a001b254CD22e46d3eAB04d937489c93174C3`](https://docs.bandchain.org/develop/supported-blockchains/#mainnets). Make sure you check the **current address** on their page, as it might happen that they updated their reference contract and then your Oracle data will not be correct anymore. 
 
 <ImageWrapper path="/img/doc-images/band-protocol-how-to/deploy.png" alt="environment" />