Bump hexbytes from 0.2.3 to 0.3.0

[dependabot]

Bumps hexbytes from 0.2.3 to 0.3.0.

Changelog

Sourced from hexbytes's changelog.

HexBytes v0.3.0 (2022-08-17)

Miscellaneous changes

- `[#28](https://github.com/ethereum/hexbytes/issues/28) <https://github.com/ethereum/hexbytes/issues/28>`__
Breaking changes

- Drop support for Python 3.6, update Sphinx doc dependency requirement (`[#27](https://github.com/ethereum/hexbytes/issues/27) &lt;https://github.com/ethereum/hexbytes/issues/27&gt;`__)
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<details>
<summary>Commits</summary>
<ul>

<li><a href="https://github.com/ethereum/hexbytes/commit/68f26a70d9875366e52b81e5a38587ef57dad4fa&quot;&gt;&lt;code&gt;68f26a7&lt;/code&gt;&lt;/a> Bump version: 0.2.3 → 0.3.0</li>

<li><a href="https://github.com/ethereum/hexbytes/commit/af7abb94bda5cf7e8fd5cfbb02f6e51942d565b0&quot;&gt;&lt;code&gt;af7abb9&lt;/code&gt;&lt;/a> Compile release notes</li>

<li><a href="https://github.com/ethereum/hexbytes/commit/12bb13a85a5105fbb62b2e962b083506496a0490&quot;&gt;&lt;code&gt;12bb13a&lt;/code&gt;&lt;/a> Bump eth-utils (<a href="https://github-redirect.dependabot.com/ethereum/hexbytes/issues/28&quot;&gt;#28&lt;/a&gt;)&lt;/li>

<li><a href="https://github.com/ethereum/hexbytes/commit/e940383d8cb3ab5057a1d6af66b369d247f4dfe3&quot;&gt;&lt;code&gt;e940383&lt;/code&gt;&lt;/a> Update sphinx, drop python 3.6 support (<a href="https://github-redirect.dependabot.com/ethereum/hexbytes/issues/27&quot;&gt;#27&lt;/a&gt;)&lt;/li>

<li>See full diff in <a href="https://github.com/ethereum/hexbytes/compare/v0.2.3...v0.3.0&quot;&gt;compare view</a></li>

</ul>

</details>
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