pip: bump ray from 2.56.0 to 2.56.1 (#2104)

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Author: dependabot[bot]

tests/requirements.txt

@@ -11,7 +11,7 @@ numpy==2.4.6
 scikit-learn==1.9.0
 lmdb==1.6.2
 pymatgen==v2026.5.4
-ray[serve]==2.56.0
+ray[serve]==2.56.1
 # Ray Serve 2.55.1 declares `protobuf>=3.20.3` with no upper bound, but is
 # not compatible with protobuf 7.x. The 7.x release (mid-June 2026) removed
 # `FieldDescriptor.label`, which Ray Serve's gRPC serialization path uses: