Support web3.py v6

[okeyzero]

1, change the function in web3py to the latest version 2, block the type of tx in FlashbotsPrivateTransactionResponse class 3, Flashbots class set the type of w3

is_async = False
w3: "Web3"

4, headers in provider.py is set by

headers = self.get_request_headers() | {
            "X-Flashbots-Signature": f"{self.signature_account.address}:{signed_message.signature.hex()}"
        }

modified to

headers = self.get_request_headers()
headers["X-Flashbots-Signature"] = f"{self.signature_account.address}:{signed_message.signature.hex()}" 

to be compatible with python versions up to 3.9

Untested changes 1, cancel_private_transaction_munger class return value type 2, mask the type of signed_transaction in the send_private_transaction_munger method

[josecyc]

I tried this PR but I'm currently getting the error Simulation error {'code': -32000, 'message': 'err: %!w(<nil>); txhash 0xcd47867bc2d4c34ae36dcab067c513d9cfb3eb701438ee8435b799dd4f756730'} during w3.flashbots.simulate(bundle, block) I'm printing everything on the simulate method:

evm_block_number 0x9f449f
evm_block_state_number 0x9f449e
evm_timestamp 1706290476
signed_bundled_transactions [HexBytes('0x02f86f058201958207d08207d082c73894b40e6efe4e4f08b0709fc160bff0570bca876e9687038d7ea4c6800080c080a0f55a40418b72e78c30317a318dfa62f0b164b7e813106241776615279b310ffea06a353e5604e1b00857074d355642cb8a7623df6e42a758b59152749c1efcf1b1'), HexBytes('0x02f86d050a8207d08207d082c73894740e764806a0ba1af2dd62f0004bf3a8403ff67e87071afd498d000080c001a0fbb1d1d7658877afb397b91f31721b0d9a3d91e465c1d29cb55872103f54f533a045b88b99ebfdc408fd35276d43f6334d1352471cdd9fbd21efc17a0ecacc7c65')]
Simulation error {'code': -32000, 'message': 'err: %!w(<nil>); txhash 0xcd47867bc2d4c34ae36dcab067c513d9cfb3eb701438ee8435b799dd4f756730'}

So it seems it's failing during:

call_result = self.call_bundle(
            signed_bundled_transactions,
            evm_block_number,
            evm_block_state_number,
            evm_timestamp,
        )

[odysseus0]

Thanks a lot for the contribution. Sorry had to merge #87 because after trying it is a bit easier to merge.