arrow

MINOR: [Dev] Remove auto close link forced in PR description (#40178)

For some reason, https://github.com/apache/arrow/pull/14783 changed the automatic GH issue link to a "Closes" reference that will forcefully close the linked issue *even if the committer chooses not to close the issue using the merge script*.

Since the original change was done without discussion, this is a MINOR PR as well.

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>