Bump typescript from 4.0.5 to 4.1.2 (#601)

Bumps [typescript](/~https://github.com/Microsoft/TypeScript) from 4.0.5 to 4.1.2.
- [Release notes](/~https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v4.0.5...v4.1.2)

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