Migrate BorderBox to TypeScript

[colebemis]

This PR migrates the BorderBox component to TypeScript as part of the TypeScript refactor.

This PR also updates the @types/styled-components dependency and styled-components dev dependency because the previous versions were causing type errors.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/primer/primer-components/orvzle9gb
✅ Preview: https://primer-components-git-cb-ts-border-box.primer.now.sh

[emplums]

Should we make this a ^ version?

[emplums]

Looks good but looks like some tests are failing, maybe due to the dependency changes?

[changeset-bot]

🦋 Changeset detected

Latest commit: 8c74234

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/components	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[colebemis]

Ran into an issue updating the styled-components and jest-styled-components dev dependencies. The problem I ran into is documented in this issue: styled-components/jest-styled-components#294

I decided to leave those versions as-is and just update the @types/styled-components version. Is it worth trying to figure out the styled-components upgrade in this PR or is only updating the types package fine?