Ensure point is at the source block when a hook is run

Since `point` can be located at an arbitrary location in an arbitrary
buffer during asynchronous execution, make sure that it is located at
the source block when running `org-babel-after-execute-hook` during
handling of "execute_reply" messages.

* jupyter-org-client.el (jupyter-handle-execute-reply): Do it.

jupyter-org-client.el

@@ -347,7 +347,8 @@ to."
       (message "An error occurred when evaluating code block."))
     (when (jupyter-org-request-async-p req)
       (jupyter-org--clear-request-id req)
-      (run-hooks 'org-babel-after-execute-hook))))
+      (org-with-point-at (jupyter-org-request-marker req)
+        (run-hooks 'org-babel-after-execute-hook)))))
 
 ;;; Completion in code blocks