Bump typescript from 3.9.3 to 4.0.3

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.3 to 4.0.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.9.3...v4.0.3)

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

package.json

@@ -141,7 +141,7 @@
     "prettier": "2.1.2",
     "push-dir": "^0.4.1",
     "stylelint": "^13.0.0",
-    "typescript": "^3.9.3"
+    "typescript": "^4.0.3"
   },
   "dependencies": {
     "modern-normalize": "^1.0.0",