fix(typescript): mark imports/exports that are only used for types explicitely

[wolfy1339]

Resolves #ISSUE_NUMBER

---

Behavior

Before the change?

• The release would fail to build because it would try to resolve the imports and fail

After the change?

• The imports and exports are explicitly marked that they are types so that esbuild can build the code

Other information

• See https://github.com/octokit/auth-app.js/actions/runs/5014775989/jobs/8989466953

---

Additional info

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Added the appropriate label for the given change

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes (Please add the Type: Breaking change label)
• No

If Yes, what's the impact:

• N/A

Pull request type

Please add the corresponding label for change this PR introduces:

• Bugfix: Type: Bug
• Dependencies/code cleanup: Type: Maintenance

---

[github-actions]

🎉 This PR is included in version 4.0.13 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀

[github-actions]

🎉 This PR is included in version 4.0.13 🎉

The release is available on:

• GitHub release
• npm package (@release-4.x dist-tag)

Your semantic-release bot 📦🚀