Update dependency typescript to ^4.0.3

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
typescript (source)	devDependencies	patch	^4.0.3	homepage, source

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Release Notes

Microsoft/TypeScript

v4.0.3

Compare Source

For release notes, check out the release announcement.

For the complete list of fixed issues, check out the

• fixed issues query for TypeScript v4.0.0 (Beta).
• fixed issues query for TypeScript v4.0.1 (RC).
• fixed issues query for TypeScript v4.0.2.
• fixed issues query for TypeScript v4.0.3.

Downloads are available on:

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

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