Bump typescript from 3.9.7 to 4.0.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.7 to 4.0.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.9.7...v4.0.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -99,7 +99,7 @@
     "shx": "^0.3.2",
     "sinon": "^9.0.0",
     "terser-webpack-plugin": "^4.0.0",
-    "typescript": "^3.8.3",
+    "typescript": "^4.0.2",
     "url-polyfill": "^1.1.5",
     "walk": "^2.3.9",
     "webpack": "4.44.1",