Fix notes on the SDE version on CI

I apparently forgot to update it in
https://boringssl-review.googlesource.com/c/boringssl/+/77347

Change-Id: I7155cf8e430c6c68bcf7995d3f11fbb4248c2bbd
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/99167
Reviewed-by: Rudolf Polzer <rpolzer@google.com>
Reviewed-by: Lily Chen <chlily@google.com>
Commit-Queue: Rudolf Polzer <rpolzer@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: Lily Chen <chlily@google.com>

util/bot/UPDATING

diff --git a/util/bot/UPDATING b/util/bot/UPDATING
index 8c0c635..006f640 100644
--- a/util/bot/UPDATING
+++ b/util/bot/UPDATING
@@ -29,6 +29,6 @@
 
     upload_to_google_storage.py -b chrome-boringssl-sde sde-linux64.tar.xz sde-win32.tar.xz
 
-The current revision is sde-external-9.38.0-2024-04-18-*.tar.xz.
+The current revision is sde-external-9.48.0-2024-11-25-*.tar.xz.
 
 When adding new files, remember to update .gitignore.