Bump @vercel/ncc from 0.25.1 to 0.28.6

Bumps [@vercel/ncc](https://github.com/vercel/ncc) from 0.25.1 to 0.28.6.
- [Release notes](https://github.com/vercel/ncc/releases)
- [Commits](https://github.com/vercel/ncc/compare/0.25.1...0.28.6)

---
updated-dependencies:
- dependency-name: "@vercel/ncc"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -31,7 +31,7 @@
     "@types/jest": "^26.0.23",
     "@types/node": "^15.12.0",
     "@typescript-eslint/parser": "^4.26.0",
-    "@vercel/ncc": "^0.25.1",
+    "@vercel/ncc": "^0.28.6",
     "eslint": "^7.27.0",
     "eslint-plugin-github": "^4.1.2",
     "eslint-plugin-jest": "^24.1.3",