doc: fix github urls to use the new org

Signed-off-by: Fabio Utzig <fabio.utzig@nordicsemi.no>
diff --git a/docs/SECURITY.md b/docs/SECURITY.md
index ae003a4..aa50858 100644
--- a/docs/SECURITY.md
+++ b/docs/SECURITY.md
@@ -39,7 +39,7 @@
 Vulnerability reports and published fixes will be reported as follows:
 
 - Issues will be entered into Github's [Security Advisory
-  system](https://github.com/JuulLabs-OSS/mcuboot/security/advisories), with
+  system](https://github.com/mcu-tools/mcuboot/security/advisories), with
   the interested parties (including the reporter) added as viewers.
 
 - The release notes will contain a reference to any allocated CVE(s).