Bump typescript from 4.9.5 to 5.1.3 in /frontend/kesaseteli/employer

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 4.9.5 to 5.1.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v4.9.5...v5.1.3)

---
updated-dependencies:
- dependency-name: typescript
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

frontend/kesaseteli/employer/package.json

@@ -46,6 +46,6 @@
   },
   "devDependencies": {
     "eslint-config-adjunct": "^4.11.1",
-    "typescript": "^4.5.5"
+    "typescript": "^5.1.3"
   }
 }