pip: bump ray from 2.55.0 to 2.55.1

Bumps [ray](https://github.com/ray-project/ray) from 2.55.0 to 2.55.1.
- [Release notes](https://github.com/ray-project/ray/releases)
- [Commits](ray-project/ray@ray-2.55.0...ray-2.55.1)

---
updated-dependencies:
- dependency-name: ray
  dependency-version: 2.55.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/requirements.txt

@@ -11,7 +11,7 @@ numpy==2.4.4
 scikit-learn==1.7.2
 lmdb==1.6.2
 pymatgen==v2026.3.23
-ray[serve]==2.55.0
+ray[serve]==2.55.1
 ipykernel==7.2.0
 jupyter_book==2.1.4
 pytest-xdist==3.8.0