chore: update beefy to substrate branch polkadot-v0.9.10

[chevdor]

This PR updates the substrate dependencies to the polkadot-v0.9.10 branch.

See below for details about the 2 CI checks that are failing.

[chevdor]

The clippy issues can be silenced by using a slightly older nightly.

echo "nightly-2021-09-01" > rust-toolchain
rustup target add wasm32-unknown-unknown
cargo clippy --all-targets -- -D warnings

As long as nightly is not newer than 2021-09-01, the tests will pass.

[chevdor]

The deny issue may require an additionnal PR in substrate though.

[tomusdrw]

@chevdor please consider ignoring the advisory for now (deny.toml), we can report that as a separate issue and deal with it later.

[chevdor]

@tomusdrw thanks for the hint. I will def. consider this option if my test does not end up well.
I am actually testing if we can integrate paritytech/substrate#9547 in the 0.9.10 release branch in substrate to address the problem.

[chevdor]

ref. paritytech/substrate#9722

[chevdor]

@tomusdrw I will do more than consider your option :) Merging paritytech/substrate#9547 is doable but it only partly solves the deny isssue.

[chevdor]

Considering the thread above, this PR would be ready to merge.

[tomusdrw]

Ugh, oh, I was hoping we can keep the CI green and ignore the advisory in deny.toml file instead of merging with failing CI.

[adoerr]

Sorry, my bad. Didn't want to block the Polkadot update any longer. Especially not since master is good and the CI issues are imo relatively minor.