Support bundlers where import.meta.url is undefined (#622)

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "@babel/core": "^7.17.5",
     "@babel/runtime": "^7.17.2",
-    "@polkadot/dev": "^0.65.79",
+    "@polkadot/dev": "^0.65.85",
     "@polkadot/x-bundle": "^8.4.1",
     "@types/jest": "^27.4.1",
     "babel-loader": "^8.2.3",
@@ -42,7 +42,7 @@
     "react-native": "^0.67.3",
     "stream-browserify": "^3.0.0",
     "vue-template-compiler": "^2.6.14",
-    "webpack": "^5.69.1",
+    "webpack": "^5.70.0",
     "webpack-cli": "^4.9.2",
     "webpack-serve": "^4.0.0"
   },