[Chore][CI] Upgrade Ray version to 2.55.0 to support entrypointLabelSelector (#4884)

Author: my-vegetable-has-exploded

.buildkite/setup-env.sh

@@ -35,7 +35,7 @@ apt-get update
 apt-get install -y python3.11 python3-pip python3-venv python3-dev build-essential
 
 # Install requirements
-pip install --break-system-packages ray[default]==2.52.0
+pip install --break-system-packages ray[default]==2.55.0
 
 # Bypass Git's ownership check due to unconventional user IDs in Docker containers
 git config --global --add safe.directory /workdir

ray-operator/test/support/defaults.go

@@ -1,7 +1,7 @@
 package support
 
 const (
-	RayVersion            = "2.52.0"
-	RayImage              = "rayproject/ray:2.52.0"
+	RayVersion            = "2.55.0"
+	RayImage              = "rayproject/ray:2.55.0"
 	KuberayUpgradeVersion = "v1.6.0"
 )