[release-branch.go1.18] go1.18.9

Change-Id: Ida61e740fc342357f54e523c0044cf6d83e0baec
Reviewed-on: https://go-review.googlesource.com/c/go/+/455597
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
Run-TryBot: Gopher Robot <gobot@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>
diff --git a/VERSION b/VERSION
index aea94a5..a7cd7b8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.18.8
\ No newline at end of file
+go1.18.9
\ No newline at end of file