chore(deps): update dependency @types/express to v5.0.6 (#283)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

backend/package.json

@@ -44,7 +44,7 @@
     "@nestjs/testing": "11.1.8",
     "@openmfp/config-prettier": "0.9.2",
     "@openmfp/eslint-config-typescript": "0.7.7",
-    "@types/express": "5.0.5",
+    "@types/express": "5.0.6",
     "@types/jest": "30.0.0",
     "@types/node": "24.10.1",
     "@types/supertest": "6.0.3",