build(deps-dev): bump typescript from 5.8.3 to 5.9.2 in /backend

Bumps [typescript](https://github.com/microsoft/TypeScript) from 5.8.3 to 5.9.2.
- [Release notes](https://github.com/microsoft/TypeScript/releases)
- [Changelog](https://github.com/microsoft/TypeScript/blob/main/azure-pipelines.release-publish.yml)
- [Commits](https://github.com/microsoft/TypeScript/compare/v5.8.3...v5.9.2)

---
updated-dependencies:
- dependency-name: typescript
  dependency-version: 5.9.2
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

backend/package-lock.json

@@ -38,7 +38,7 @@
         "jest": "^30.0.5",
         "ts-jest": "^29.4.0",
         "tsx": "^4.20.3",
-        "typescript": "^5.8.3"
+        "typescript": "^5.9.2"
       }
     },
     "node_modules/@ampproject/remapping": {
@@ -9170,9 +9170,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "5.8.3",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.8.3.tgz",
-      "integrity": "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ==",
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
+      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {

backend/package.json

@@ -40,7 +40,7 @@
     "jest": "^30.0.5",
     "ts-jest": "^29.4.0",
     "tsx": "^4.20.3",
-    "typescript": "^5.8.3"
+    "typescript": "^5.9.2"
   },
   "dependencies": {
     "@fastify/type-provider-typebox": "^5.2.0",