fix: rm override workaround for eth-utils

[mmsqe]

to avoid attribute 'override' missing error when bump nixpkgs to 25.05, for more info

Contribution checklist (recommended but not always applicable/required):

• There's an automated test for this change
• Commit messages or code include references to related issues or PRs (including third parties)
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[elikoga]

I don't see how crypto-org-chain/ethermint#569 is related when looking over the diff.

Originally this was introduced by #1176 in response to #1161.

From the wording in #1176 it sounds to me like this change would be a welcome change since (if it works) it should remove the workaround.

Ideally we can add the original or a new reproduction/integration test to ./tests.

[mmsqe]

since eth-hash fix the cycle issue since v0.3.2, not sure if we still need fix the override?

[mmsqe]

Just added eth-utils-test to reproduce attribute 'override' missing error, see if it's ok @elikoga