Bump elliptic and web3 in /demo/react-app-no-modal

Bumps [elliptic](https://github.com/indutny/elliptic) to 6.6.1 and updates ancestor dependency [web3](https://github.com/ChainSafe/web3.js). These dependencies need to be updated together.


Updates `elliptic` from 6.5.4 to 6.6.1
- [Commits](indutny/elliptic@v6.5.4...v6.6.1)

Updates `web3` from 1.10.0 to 4.16.0
- [Release notes](https://github.com/ChainSafe/web3.js/releases)
- [Changelog](https://github.com/web3/web3.js/blob/4.x/CHANGELOG.md)
- [Commits](web3/web3.js@v1.10.0...v4.16.0)

---
updated-dependencies:
- dependency-name: elliptic
  dependency-type: indirect
- dependency-name: web3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]