chore(deps-dev): Bump @types/node from 20.19.4 to 24.3.0 in /backend

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 20.19.4 to 24.3.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-version: 24.3.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -62,7 +62,7 @@
     "hono": "^4.8.5"
   },
   "devDependencies": {
-    "@types/node": "^20.0.0",
+    "@types/node": "^24.3.0",
     "@typescript-eslint/eslint-plugin": "^8.44.0",
     "@typescript-eslint/parser": "^8.44.0",
     "esbuild": "^0.25.6",