Remove mumbai from supported networks

[clemsos]

The Polygon Mumbai testnet is getting deprecated (as it uses Goerli underneath) and we should remove it from our supported networks.

see official annoucement : https://polygon.technology/blog/introducing-the-amoy-testnet-for-polygon-pos

The beloved and widely used Mumbai testnet for Polygon PoS uses Ethereum’s Goerli testnet as its root chain. This means Mumbai counts on Goerli for block production.

relates to #13428

[StephanGerbeth]

Do you plan to deploy unlock to amoy?

[clemsos]

Do you plan to deploy unlock to amoy?

Hello @StephanGerbeth, we are limiting the number of testnets we support atm so we wont be supporting Amoy - only Sepolia and Base Sepolia.