chore(deps): update dependency @api3/contracts to v28

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
     "firebase:emulator": "pnpm docs:build; firebase emulators:start"
   },
   "devDependencies": {
-    "@api3/contracts": "^27.4.0",
+    "@api3/contracts": "^28.0.0",
     "@api3/dapi-management": "^3.55.0",
     "@types/node": "^22.18.3",
     "axios": "^1.12.1",