pin hexbytes>=1.0.0 due to breaking change

[pacrob]

What was wrong?

hexbytes had a breaking change in the step from 0.3.x to 1.0.0. hexbytes was capped at <0.4.0 in the previous eth-account release.

How was it fixed?

This pr sets dependency to hexbytes>=1.0.0.

Related to https://github.com/ethereum/hexbytes/pull/38/files

Todo:

• [x] Clean up commit history

• [x] Add or update documentation related to these changes

• [x] Add entry to the release notes

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[pacrob]

This will be done after web3 v7 is released. Closing.