Bump ws and ethers in /solver

Bumps [ws](https://github.com/websockets/ws) to 8.17.1 and updates ancestor dependency [ethers](https://github.com/ethers-io/ethers.js). These dependencies need to be updated together.


Updates `ws` from 7.4.6 to 8.17.1
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.4.6...8.17.1)

Updates `ethers` from 5.7.2 to 6.13.4
- [Release notes](https://github.com/ethers-io/ethers.js/releases)
- [Changelog](https://github.com/ethers-io/ethers.js/blob/main/CHANGELOG.md)
- [Commits](ethers-io/ethers.js@v5.7.2...v6.13.4)

---
updated-dependencies:
- dependency-name: ws
  dependency-type: indirect
- dependency-name: ethers
  dependency-type: direct:production
...

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