fix some relative links to volta

tests/network-tests/package.json

@@ -34,6 +34,6 @@
     "typescript": "^3.8.3"
   },
   "volta": {
-    "extends": "../package.json"
+    "extends": "../../package.json"
   }
 }

utils/api-scripts/package.json

@@ -22,5 +22,8 @@
     "@polkadot/ts": "^0.1.56",
     "typescript": "^3.9.7",
     "ts-node": "^8.6.2"
+  },
+  "volta": {
+    "extends": "../../package.json"
   }
 }