Remove UpdatePodSandboxResources from graduation criteria

Author: natasha41575

keps/sig-node/1287-in-place-update-pod-resources/README.md

@@ -1414,6 +1414,8 @@ The following items have been removed from the stable graduation criteria:
   lack of support for resize is now a significant missing piece of that functionality; however
   we don't believe this is a strong enough reason to block IPPR GA. We can, however, consider
   whether this should block GA of pod level resources.
+- `UpdatePodSandboxResources` is implemented by containerd & CRI-O. This is going to be re-evaluated
+  in the context of pod level resources resizing.
 - Re-evaluate the following decisions:
   - Resize atomicity: Resizes will stay atomic. Allowing partial resizes adds significant complexity
     and the use case is unclear.