Bump ray from 2.4.0 to 2.8.1 (#1309)

Bumps [ray](https://github.com/ray-project/ray) from 2.4.0 to 2.8.1.
- [Release notes](https://github.com/ray-project/ray/releases)
- [Commits](ray-project/ray@ray-2.4.0...ray-2.8.1)

---
updated-dependencies:
- dependency-name: ray
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>