build(deps): bump acorn from 8.3.0 to 8.4.0

Bumps [acorn](https://github.com/acornjs/acorn) from 8.3.0 to 8.4.0.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@8.3.0...8.4.0)

---
updated-dependencies:
- dependency-name: acorn
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]