[release-branch.go1.11-security] go1.11.13

Change-Id: Idf5f9d00388b0da77f2c2ce3650eb65271bd9e68
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/526996
Reviewed-by: Filippo Valsorda <valsorda@google.com>

VERSION

diff --git a/VERSION b/VERSION
index f723162..4776251 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.11.12
\ No newline at end of file
+go1.11.13
\ No newline at end of file