fix: types inside mev_calls.rs

[SkandaBhat]

Motivation

ref: https://github.com/paradigmxyz/reth/issues/9472 Some types in mev_calls.rs are wrong

Solution

Updated types according to flashbots builder implementation: https://github.com/flashbots/builder/blob/df9c765067d57ab4b2d0ad39dbb156cbe4965778/core/sbundle_sim.go#L26

PR Checklist

• [ ] Added Tests
• [ ] Added Documentation
• [ ] Breaking changes