Fix Foundry-related configuration

[gabrielstoica]

What changed? Why?

1. Fix typo in foundry.toml file.
2. Add url param to Etherscan config as per Foundry documentation. Upon running forge script script/BuyMeACoffee.s.sol --rpc-url base_sepolia we'll get the following error: "At least one of 'url' or 'chain' must be present for Etherscan config with unknown alias 'base_sepolia'", hence adding the url of the explorer will fix it.
3. Use the base_sepolia alias directly in the TOML file instead of referencing it to avoid any errors.

[gabrielstoica]

Hi @Zizzamia, @Sneh1999!
Base Mainnet, Base Goerli and Base Sepolia now have aliases that can be used directly in the foundry.toml file. This also eliminates the need to append --etherscan-api-key ${BLOCK_EXPLORER_API_KEY} to each forge script call.

FYI: alloy-rs/chains#32 and foundry-rs/foundry#6905

[Sneh1999]

LGTM! @gabrielstoica great work and thanks again for the contribution.

[gabrielstoica]

Thanks @Sneh1999, happy to contribute!

[Zizzamia]

Brilliant!
Thank you @gabrielstoica @mattsse @DaniPopes and @Evalir