Summary:
Bumps [acorn](https://github.com/acornjs/acorn) from 6.4.0 to 6.4.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="9a2e9b6678"><code>9a2e9b6</code></a> Mark version 6.4.1</li>
<li><a href="90a9548ea0"><code>90a9548</code></a> More rigorously check surrogate pairs in regexp validator</li>
<li>See full diff in <a href="https://github.com/acornjs/acorn/compare/6.4.0...6.4.1">compare view</a></li>
</ul>
</details>
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</details>
Pull Request resolved: https://github.com/facebook/infer/pull/1238
Reviewed By: dulmarod
Differential Revision: D20513549
Pulled By: jvillard
fbshipit-source-id: 92cc20052
dependabot[bot]
Yangshun Tay
BSKY
