build(deps-dev): bump typescript from 3.8.3 to 4.0.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.3 to 4.0.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.8.3...v4.0.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -61,7 +61,7 @@
 		"@typescript-eslint/eslint-plugin": "^2.26.0",
 		"glob": "^7.1.6",
 		"mocha": "^7.1.1",
-		"typescript": "^3.8.3",
+		"typescript": "^4.0.2",
 		"vscode-test": "^1.3.0"
 	}
 }