Bump roots/acorn from 1.0.4 to 1.0.6 (#2444)

Bumps [roots/acorn](https://github.com/roots/acorn) from 1.0.4 to 1.0.6.
- [Release notes](https://github.com/roots/acorn/releases)
- [Commits](roots/acorn@v1.0.4...v1.0.6)

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