Update dependency typescript to v3.9.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
typescript (source)	3.9.7 -> 3.9.9

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Release Notes

Microsoft/TypeScript

### [`v3.9.9`](https://togithub.com/Microsoft/TypeScript/releases/v3.9.9) [Compare Source](https://togithub.com/Microsoft/TypeScript/compare/v3.9.8...v3.9.9) This release contains a fix for [an issue when language service plugins have no specified name](https://togithub.com/microsoft/TypeScript/issues/42718). ### [`v3.9.8`](https://togithub.com/Microsoft/TypeScript/releases/v3.9.8) [Compare Source](https://togithub.com/Microsoft/TypeScript/compare/v3.9.7...v3.9.8) This release contains fixes for a [security risk involving language service plugin loading](https://togithub.com/microsoft/TypeScript/issues/42712). More details are available [here](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1639).

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