Bump typescript from 4.1.5 to 4.2.3 (#645)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 4.1.5 to 4.2.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v4.1.5...v4.2.3)

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