chore(deps-dev): bump typescript from 5.8.3 to 5.9.2 (#253)

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](microsoft/TypeScript@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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -49,7 +49,7 @@
     "prettier-plugin-svelte": "^3.4.0",
     "svelte": "5.38.2",
     "svelte-check": "^4.3.1",
-    "typescript": "5.8.3",
+    "typescript": "5.9.2",
     "vite": "^7.1.3",
     "vitest": "^2.0.2"
   },

packages/backend/package.json

@@ -69,7 +69,7 @@
     "eslint-plugin-redundant-undefined": "^1.0.0",
     "eslint-plugin-sonarjs": "^1.0.4",
     "prettier": "^3.6.2",
-    "typescript": "5.8.3",
+    "typescript": "5.9.2",
     "vite": "^7.1.3",
     "vitest": "^2.0.2"
   },