chore(deps): update dependency typescript to v3.4.3

This MR contains the following updates:

Package	Type	Update	Change	References
typescript	devDependencies	patch	3.4.2 -> 3.4.3	homepage, source

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Release Notes

Microsoft/TypeScript

v3.4.3

Compare Source

This release forces TypeScript to clear its automatic type acquisition (ATA) cache based on patch versions. This means all consumers of TSServer can update to newer patch releases of TypeScript to clear the ATA cache if ATA has downloaded stale .d.ts files that can hang the language service.

For the complete list of fixed issues, check out the

• fixed issues query for Typescript v3.4 RC.
• fixed issues query for Typescript v3.4.1.
• relevant changes in 3.4.2
• relevant changes in 3.4.3

Downloads are available on:

• npm
• Visual Studio 2017/2019 (Select new version in project options)
• NuGet package

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