Update dependency typescript to v3.9.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
typescript (source)	devDependencies	minor	3.8.3 -> 3.9.2

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Release Notes

Microsoft/TypeScript

### [`v3.9.2`](https://togithub.com/Microsoft/TypeScript/releases/v3.9.2) [Compare Source](https://togithub.com/Microsoft/TypeScript/compare/v3.8.3...v3.9.2) For release notes, check out the [release announcement](https://devblogs.microsoft.com/typescript/announcing-typescript-3-9/). For the complete list of fixed issues, check out the - [fixed issues query for Typescript v3.9.0 (Beta)](https://togithub.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.9.0%22+is%3Aclosed+). - [fixed issues query for Typescript v3.9.1 (RC)](https://togithub.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.9.1%22+is%3Aclosed+). - [fixed issues query for Typescript v3.9.2 (Final)](https://togithub.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue+milestone%3A%22TypeScript+3.9.2%22+is%3Aclosed+). Downloads are available on: - [npm](https://www.npmjs.com/package/typescript) - [Visual Studio 2017/2019](https://marketplace.visualstudio.com/items?itemName=TypeScriptTeam.TypeScript-39) ([Select new version in project options](https://togithub.com/Microsoft/TypeScript/wiki/Updating-TypeScript-in-Visual-Studio-2017)) - [NuGet package](https://www.nuget.org/packages/Microsoft.TypeScript.MSBuild)

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