build: add missing raw-loader dependency

The build-webpack large spec uses it, but it was toplevel only because it was hoisted.

Author: filipesilva

package.json

@@ -132,6 +132,7 @@
     "prettier": "^2.0.0",
     "puppeteer": "2.1.1",
     "quicktype-core": "^6.0.15",
+    "raw-loader": "4.0.0",
     "rxjs": "6.5.4",
     "sauce-connect-proxy": "https://saucelabs.com/downloads/sc-4.5.4-linux.tar.gz",
     "semver": "7.1.3",