community[patch]: Small Fix in OutlookMessageLoader (Close the Message once Open) (#22744)

- **Description:** A very small fix where we close the message when it
opened
- **Issue:** #22729

libs/community/langchain_community/document_loaders/email.py

@@ -116,3 +116,4 @@ class OutlookMessageLoader(BaseLoader):
                 "date": msg.date,
             },
         )
+        msg.close()