fix(scripts): fixed async migration issue in generate changed icons comment markup

[jguddas]

What is the purpose of this pull request?

• [ ] New Icon
• [x] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [ ] Other:

Description

The PR comment action is failling since we migrated to using fs/promises, this fixes it.

Before Submitting

• [x] I've read the Contribution Guidelines.
• [ ] I've checked if there was an existing PR that solves the same issue.