chore: mark mantle and mantle sepolia chains as supporting eip 1559

[luzzif]

Motivation

Mantle and Mantle Sepolia support EIP 1559. As proof, we can see that by doing:

// for mantle
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}' https://rpc.mantle.xyz

// for mantle sepolia
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}' https://rpc.sepolia.mantle.xyz

the returned block object contains the baseFeePerGas attribute.

Solution

I just updated the is_legacy function by moving Mantle and MantleSepolia to the false arm.

P.S.: I have a Rust program posting transactions to Mantle Sepolia and all of them are currently failing at the fill_transaction stage. Is there any workaround I can use while this is being reviewed and released?

[mattsse]

can you please apply the changes to https://github.com/alloy-rs/chains instead

[luzzif]

I can do that too, but in my project I'm still using Ethers. Has Ethers been completely deprecated in favor of alloy?

Edit: The configuration is already correct in alloy