feat(nodes.py): add optional memory field to MidJourneyPromptChainNode class constructor

src/backend/langflow/template/nodes.py

@@ -123,6 +123,13 @@ class MidJourneyPromptChainNode(FrontendNode):
                 multiline=False,
                 name="llm",
             ),
+            TemplateField(
+                field_type="BaseChatMemory",
+                required=False,
+                show=True,
+                name="memory",
+                advanced=False,
+            ),
         ],
     )
     description: str = "MidJourneyPromptChain is a chain you can use to generate new MidJourney prompts."