Bump typescript from 4.1.3 to 4.3.4

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 4.1.3 to 4.3.4.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v4.1.3...v4.3.4)

---
updated-dependencies:
- dependency-name: typescript
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -10,7 +10,7 @@
     "@guardian/types": "github:guardian/types#semver:^4.0.0",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
-    "typescript": "^4.1.3"
+    "typescript": "^4.3.4"
   },
   "devDependencies": {
     "@babel/cli": "^7.13.10",