Update dependency typescript to ~5.9.0

Author: renovate[bot]

Tekst-Web/package.json

@@ -63,7 +63,7 @@
     "openapi-typescript": "^7.4.1",
     "prettier": "^3.3.3",
     "start-server-and-test": "^2.0.8",
-    "typescript": "~5.8.0",
+    "typescript": "~5.9.0",
     "vite": "^7.0.0",
     "vue-tsc": "^3.0.0",
     "yaml": "^2.7.0"