Bump acorn-walk from 7.1.1 to 7.2.0 (#14077)

Bumps [acorn-walk](https://github.com/acornjs/acorn) from 7.1.1 to 7.2.0.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/7.1.1...7.2.0

)

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