chore(deps): update dependency jest to v30

Author: renovate[bot]

backend/package.json

@@ -50,7 +50,7 @@
     "eslint": "9.28.0",
     "eslint-config-prettier": "^10.1.2",
     "eslint-plugin-prettier": "^5.2.6",
-    "jest": "^29.7.0",
+    "jest": "^30.0.0",
     "prettier": "^3.5.3",
     "source-map-support": "^0.5.21",
     "supertest": "^7.1.0",