chore(deps-dev): bump typescript from 3.8.3 to 3.9.9 (#27)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.3 to 3.9.9.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.8.3...v3.9.9)

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