Make state field nullable

For CAPI 3.92 compatibility

Author: Alexey Nesterov

cloudfoundry-client/src/main/java/org/cloudfoundry/client/v3/deployments/Deployment.java

@@ -84,6 +84,7 @@ public abstract class Deployment extends Resource {
      */
     @Deprecated
     @JsonProperty("state")
+    @Nullable
     public abstract DeploymentState getState();
 
     /**