fix: Set '@typescript-eslint/return-await' rule to 'always' for node code (no-changelog) (#8363)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/@n8n/nodes-langchain/nodes/memory/MemoryManager/MemoryManager.node.ts

@@ -324,6 +324,6 @@ export class MemoryManager implements INodeType {
 			result.push(...executionData);
 		}
 
-		return this.prepareOutputData(result);
+		return await this.prepareOutputData(result);
 	}
 }