Change from zeit -> vercel

[All of the packages are deprecated due to company name change](https://vercel.com/blog/zeit-is-now-vercel)

package.json

@@ -35,7 +35,7 @@
     "@types/jest": "^26.0.5",
     "@types/node": "^14.6.0",
     "@typescript-eslint/parser": "^3.7.0",
-    "@zeit/ncc": "^0.20.5",
+    "@vercel/ncc": "^0.23.0",
     "eslint": "^5.16.0",
     "eslint-plugin-github": "^4.0.1",
     "eslint-plugin-jest": "^23.18.0",