Prepare polkadot-v0.9.41 branch

[jasl]

Hi, I see Polkadot v0.9.41 fixed a few client issues, our users report using our latest node (based on polkadot-v0.9.40) meets syncing performance regression, I guess it might be related.

could you make a polkadot-v0.9.41 for Cumulus?

[bkchr]

@EgorPopelyaev could you please do this?

[EgorPopelyaev]

polkadot-v0.9.41 branch is ready

[jasl]

polkadot-v0.9.41 branch is ready

Thank you!

[jasl]

@EgorPopelyaev sorry, this look not compile

error[E0046]: not all trait items implemented, missing: `best_hash`
   --> /Users/jasl/.cargo/git/checkouts/cumulus-59522f43471fa161/fc7cad7/client/relay-chain-minimal-node/src/blockchain_rpc_client.rs:307:1
    |
307 | impl AuthorityDiscovery<Block> for BlockChainRpcClient {
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `best_hash` in implementation
    |
    = help: implement the missing item: `fn best_hash(&'life0 self) -> Pin<Box<(dyn futures::Future<Output = Result<<Block as BlockT>::Hash, sc_authority_discovery::Error>> + std::marker::Send + 'async_trait)>> { todo!() }`

error[E0560]: struct `Params<_>` has no field named `chain`
  --> /Users/jasl/.cargo/git/checkouts/cumulus-59522f43471fa161/fc7cad7/client/relay-chain-minimal-node/src/network.rs:75:3
   |
75 |         chain: client.clone(),
   |         ^^^^^ `Params<_>` does not have this field
   |
   = note: available fields are: `role`, `executor`, `network_config`, `protocol_id`, `genesis_hash` ... and 5 others

Some errors have detailed explanations: E0046, E0560.
For more information about an error, try `rustc --explain E0046`.
error: could not compile `cumulus-relay-chain-minimal-node` due to 2 previous errors
warning: build failed, waiting for other jobs to finish...

[jasl]

Need to cherrypick #2401 and #2385

[bkchr]

Yeah that was my fault! Fixed!