[release-branch.go1.11] go1.11.9

Change-Id: If4ab7c431f11a2d3db677b323dd85e0e8ce6de03
Reviewed-on: https://go-review.googlesource.com/c/go/+/171837
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

VERSION

diff --git a/VERSION b/VERSION
index 28cde35..22290eb 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.11.8
\ No newline at end of file
+go1.11.9
\ No newline at end of file