Update OCP virt to 4.19 in platform-support.rst (#240)

Signed-off-by: Andrew Chen <[email protected]>

Author: chenopis

gpu-operator/platform-support.rst

@@ -510,7 +510,7 @@ Operating System    Kubernetes           KubeVirt              OpenShift Virtual
 ================    ===========   =============   =========    =============    ===========
 Ubuntu 20.04 LTS    1.23---1.29   0.36+           0.59.1+
 Ubuntu 22.04 LTS    1.23---1.29   0.36+           0.59.1+
-Red Hat Core OS                                                4.12---4.18      4.13---4.18
+Red Hat Core OS                                                4.12---4.19      4.13---4.19
 ================    ===========   =============   =========    =============    ===========
 
 You can run GPU passthrough and NVIDIA vGPU in the same cluster as long as you use