fix: downgrade typescript to fix dynamic import issue

[ttacon]

When I updated several packages, I also update TypeScript by a few minor versions - it is rare, but this caught a bug with a new TypeScript version. TypeScript 4.9 introduced a change that altered how dynamic imports worked (see attached screenshot for the issue in the changelog for TS 4.9). This change, cause dynamic imports to be transpiled from:

Promise.resolve().then(function () { return require(x); })

to

(_a = x, Promise.resolve().then(() => require(_a))

When transpiling to a CommonJS module format, which we are doing. This is a problem, because while Webpack tree-shaking can determine asset relevance in the first example, it cannot in the second.

This PR forces the TS resolution to stop at 4.8.4, which removes this change and maintains the prior transpilation of the Icon component.

[github-actions]

🎉 This PR is included in version 4.0.0-alpha.170 🎉

The release is available on:

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

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