Bump roots/acorn from 1.0.8 to 1.0.9 (#2500)

Bumps [roots/acorn](https://github.com/roots/acorn) from 1.0.8 to 1.0.9.
- [Release notes](https://github.com/roots/acorn/releases)
- [Commits](roots/acorn@v1.0.8...v1.0.9)

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