[release-branch.go1.13-security] go1.13.13

Change-Id: I65f5d9cc1363d369ced4496c1d6d3d7f9144f1b8
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/794127
Reviewed-by: Katie Hockman <katiehockman@google.com>

VERSION

diff --git a/VERSION b/VERSION
index 0b3e27f..4e2f10e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.13.12
\ No newline at end of file
+go1.13.13
\ No newline at end of file