Upgrade acorn to version 7.4.1

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ acorn (^6.1.1 → ^7.4.1) · Repo

Commits

See the full diff on Github. The new version differs by 2 commits:

• Mark version 7.4.1
• Fix potentially-exponential regular expression in use-strict-scanning

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