Upgrade react-docgen-typescript to 2.x

[phildenhoff]

Change description

react-docgen-typescript 1.20.5 has a bug styleguidist/react-docgen-typescript#356 that causes us not to be able to generate React snippets for our Typescript components using the Zeplin CLI.

That issue was resolved last year in styleguidist/react-docgen-typescript#360, which is in release 2.0.0.

This PR upgrades the dependency to 2.x to include that fix. Upgrading Typescript was a requirement to upgrade to this version.

As a work-around, I was able to lock the package resolution in our package by setting a resolution in package.json, but I'd prefer not to.

"resolutions": {
  "react-docgen-typescript": "2.0.0"
}

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)

Related issues

None — I fixed this issue instead of reporting it.

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as necessary
• "Ready for review" label attached and reviewers assigned
• Changes have been reviewed by at least one other contributor
• Pull request linked to task tracker where applicable