chore: remove unused dependencies

Author: haoqunjiang

packages/@vue/cli-service/package.json

@@ -61,12 +61,10 @@
     "lodash.transform": "^4.6.0",
     "mini-css-extract-plugin": "^0.8.0",
     "minimist": "^1.2.0",
-    "ora": "^3.4.0",
     "portfinder": "^1.0.25",
     "postcss-loader": "^3.0.0",
     "read-pkg": "^5.1.1",
     "slash": "^3.0.0",
-    "source-map-url": "^0.4.0",
     "ssri": "^7.1.0",
     "string.prototype.padend": "^3.0.0",
     "terser-webpack-plugin": "^2.2.1",