v0.9.20 dependency update

[tgmichel]

What does it do?

• Nimbus weight related changes:
  • Fix author-inherent, update weight nimbus#47
  • Girazoki benchmark kick off authorship validation nimbus#48

Requires audit for changes introduced in:

• Pre-validation fixes and dispatch error handling  polkadot-evm/frontier#662
• Add extrinsic weight and lenght check polkadot-evm/frontier#637. This takes away the need of having in our runtime common:

fn validate_self_contained_inner(
    call: &Call,
    eth_call: &pallet_ethereum::Call<Runtime>,
    signed_info: &<Call as fp_self_contained::SelfContainedCall>::SignedInfo
) -> TransactionValidity {
    .....
    let extra_validation = SignedExtra::validate_unsigned(
        call,
        &call.get_dispatch_info(),
        input_len,
    )?;
    .....
}

With the changes introduced in frontier, pallet-ethereum now does call CheckWeight manually (rest of necessary Extra validation is already taken care on the self contained validation of pallet-ethereum i.e. Nonce).

cc @librelois Please if you can review this last mentioned change and verify that's all that is required validation wise.

What important points reviewers should know?

Is there something left for follow-up PRs?

What alternative implementations were considered?

Are there relevant PRs or issues in other repositories (Substrate, Polkadot, Frontier, Cumulus)?

What value does it bring to the blockchain users?

[tgmichel]

@crystalin in the description I linked 2 nimbus PRs that change weights, and might break previous assumptions when accesing the pallets' functionality through precompiles in existing contracts. Should I add breakapi label in this case?

[notlesh]

Are you avoiding having a moonbeam-polkadot-v0.9.20 branch for substrate? I guess that simplifies things, and we usually don't need to mod the substrate repo... 🤔

[librelois]

LGTM