chore: update TypeScript to v4.7.4

[dkoo]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Updates TypeScript to v4.7.4 to match WP Calypso.

How to test the changes in this Pull Request:

You'll have to manually update a repository that uses this package to install the package from a local build.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[dkoo]

Superseded by #219.