Bump acorn

Bumps the npm_and_yarn group with 1 update in the /view/ixviewer/gulp directory: [acorn](https://github.com/acornjs/acorn).


Updates `acorn` from 7.1.0 to 7.4.1
- [Commits](acornjs/acorn@7.1.0...7.4.1)

---
updated-dependencies:
- dependency-name: acorn
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>