chore(tests): update modexp eip-7883 to latest spec.

[spencer-tb]

🗒️ Description

Updates the modexp repricing tests to the latest spec: ethereum/EIPs#9855

To test filling this PR locally, follow the steps below.

1. Update the EELS resolutions file to the following:

 "Osaka": {
        "git_url": "https://github.com/spencer-tb/execution-specs.git",
        "branch": "forks/osaka-devnet-2",
        "commit": "a813e35301e9fa3fdee750d5070d51f47313d67a"
    }

2. Update the EELS resolver to use the following commit within pyproject.toml:

ethereum-spec-evm-resolver = { git = "https://github.com/spencer-tb/ethereum-spec-evm-resolver", rev = "ee273e7344e24a739ebfbf0ea1f758530c4d032b" }

🔗 Related Issues

#1579

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.

[marioevz]

LGTM, thanks!