[release-branch.go1.13] go1.13.9

Change-Id: Ia0ad75ee0458df95f1e4e36cd440f4cb314c67cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/223940
Run-TryBot: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>

VERSION

diff --git a/VERSION b/VERSION
index 70023c4..4c9ff57 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.13.8
\ No newline at end of file
+go1.13.9
\ No newline at end of file