chore(deps-dev): bump @zeit/ncc from 0.20.5 to 0.21.1

Bumps [@zeit/ncc](https://github.com/zeit/ncc) from 0.20.5 to 0.21.1.
- [Release notes](https://github.com/zeit/ncc/releases)
- [Commits](https://github.com/zeit/ncc/compare/0.20.5...0.21.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -43,7 +43,7 @@
     },
     "devDependencies": {
         "@types/jest": "^24.0.18",
-        "@zeit/ncc": "^0.20.5",
+        "@zeit/ncc": "^0.21.1",
         "jest": "^24.9.0",
         "jest-when": "^2.7.0",
         "semantic-release": "^15.13.24"