Bump cross-fetch and next

Removes [cross-fetch](https://github.com/lquixada/cross-fetch). It's no longer used after updating ancestor dependency [next](https://github.com/vercel/next.js). These dependencies need to be updated together.


Removes `cross-fetch`

Updates `next` from 10.0.6 to 10.2.3
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v10.0.6...v10.2.3)

---
updated-dependencies:
- dependency-name: cross-fetch
  dependency-type: indirect
- dependency-name: next
  dependency-type: direct:production
...

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

package.json

@@ -33,7 +33,7 @@
     "ethereum-blockies": "github:MyEtherWallet/blockies",
     "ethjs": "^0.4.0",
     "ms": "^2.1.3",
-    "next": "^10.0.6",
+    "next": "^10.2.3",
     "nextron": "^6.0.3",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",