chore: replace eth2_hashing with ethereum_hashing

[come-maiz]

This is a necessary step to update ring, which is necessary to build in risc-v.

Part of #1444.

What was wrong?

trin fails to build in risc-v

How was it fixed?

It is still not fixed. This is just one step forward.

To-Do

• Clean up commit history and use conventional commits.

[come-maiz]

Thanks to @haurog and @michaelsproul for fixing the ring dependency in ethereum_hashing:
sigp/ethereum_hashing#8

[KolbyML]

@come-maiz CI is going to fail because of how you named your commit, could you amend the commits name following these guidelines https://www.conventionalcommits.org/en/v1.0.0/

[KolbyML]

chore: replace eth2_hashing with ethereum_hashing

^ something like this would be good

[come-maiz]

Yes, done ^_^

[KolbyML]

Yes, done ^_^

Thank you for your first contribution