Fix bug in spec1135IT which surfaced since implementing

eclipse-ee4j/mojarra#5164 -- it's basically
illegal to ExternalContext#getResponseOutputWriter() directly instead of
using FacesContext#getResponseWriter()

tck/faces23/systemEvent/src/main/java/ee/jakarta/tck/faces/test/servlet40/systemevent/PostRenderViewEventBean.java

@@ -20,8 +20,8 @@
 import java.io.IOException;
 
 import jakarta.enterprise.context.RequestScoped;
-import jakarta.faces.annotation.FacesConfig;
 import jakarta.faces.context.ExternalContext;
+import jakarta.faces.context.FacesContext;
 import jakarta.faces.event.ComponentSystemEvent;
 import jakarta.inject.Inject;
 import jakarta.inject.Named;
@@ -30,18 +30,22 @@
 @RequestScoped
 public class PostRenderViewEventBean {
 
+    @Inject
+    private FacesContext facesContext;
+
     @Inject
     private ExternalContext externalContext;
 
     public void pre(ComponentSystemEvent event) throws IOException {
-        externalContext.getResponseOutputWriter().write("<!-- pre -->");
+        facesContext.setResponseWriter(facesContext.getRenderKit().createResponseWriter(externalContext.getResponseOutputWriter(), "text/html", "UTF-8"));
+        facesContext.getResponseWriter().write("<!-- pre -->");
     }
 
     public String getRender() {
         return "render";
     }
 
     public void post(ComponentSystemEvent event) throws IOException {
-        externalContext.getResponseOutputWriter().write("<!-- post -->");
+        facesContext.getResponseWriter().write("<!-- post -->");
     }
 }