Upgrade subxt

[fewensa]

Update subxt and adapt darwinia

[fewensa]

keep checking: darwinia-network/bridger#185
this branch use [email protected]

[hackfisher]

@fewensa this version is using jsonrpsee 3.0.0?

[fewensa]

It's 0.3.0 not 3.0.0
Since this commit paritytech@2749bd3 (paritytech#289), substrate-subxt use jsonrpsee 0.3.0

[fewensa]

cargo test will fail.
two reasons:

1. paritytech/substrate-subxt still fail https://github.com/paritytech/substrate-subxt/runs/3399810085
2. the test chain is only support RuntimeMetadata::V12, but darwinia is RuntimeMetadata::V13
   https://github.com/darwinia-network/substrate-subxt/blob/2846c0d695c8dd806262057aa3cb8a027fd308b3/.github/workflows/rust.yml#L28

we need test use bridger

[hackfisher]

@fewensa looks like we've merge the changes in current dependency(metadata branch) to this PR?

We'll merge this and then use master as dependency, right?

[fewensa]

yes, when merged the bridge darwinia-ethereum will change to master branch.
we will decide on a better solution later, because there are other chains supported, use tag or multiple branch

[fewensa]

for issue darwinia-network/bridger#256