Pectra devnet-5: `execution_requests` needs latest alloy and should have the `request_type` byte prefixed to each

[ryanschneider]

rbuilder/crates/rbuilder/src/building/mod.rs

Line 613 in 4d273c9

let requests = if ctx

As part of our updates for devnet-5, we need to:

• Update to latest alloy, specifically 0.7.2+ for this issue (but see below)
• Update the code above to make sure we use push_request_with_type (https://github.com/alloy-rs/alloy/blob/main/crates/eips/src/eip7685.rs#L43C12-L43C34) when adding each request type (or otherwise handle making sure we prefix each entry in the Requests vector with the proper request type byte.
• Furthermore we'll need to use [Bug] SignedBidSubmissionV4 needs to use "JSON" encoding of execution requests alloy-rs/alloy#1763 from an yet-unreleased alloy to convert the Requests to a RequestsV4 when building the SignedBidSubmissionV4

The above presumes that ethereum/builder-specs#107 is accepted, but that's looking less likely. Now instead we probably have to add "SSZ as JSON" style serialization to the Requests type to support posting blinded blocks to the relay.