build(deps): bump typescript from 3.9.7 to 4.0.2 in /web

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/commits)

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

web/package.json

@@ -20,7 +20,7 @@
     "react-router-dom": "^5.2.0",
     "react-scripts": "^3.4.3",
     "slugify": "^1.4.5",
-    "typescript": "^3.9.7"
+    "typescript": "^4.0.2"
   },
   "scripts": {
     "start": "react-app-rewired start",