[release-branch.go1.21] go1.21.5

Change-Id: I203463900d2c63bc398c22593d0908c4f33a6990
Reviewed-on: https://go-review.googlesource.com/c/go/+/547416
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/VERSION b/VERSION
index 74f07e5..e050468 100644
--- a/VERSION
+++ b/VERSION
@@ -1,2 +1,2 @@
-go1.21.4
-time 2023-11-01T20:46:39Z
+go1.21.5
+time 2023-11-29T21:21:46Z