Fix link to .well-known/security.txt.

The markdown checker does not accept links in <> syntax.

Signed-off-by: Kurt Garloff <kurt@garloff.de>

Author: garloff

blog/2026-04-08-cve-2026-33551.md

@@ -84,7 +84,7 @@ fixing and coordinating this issue.
 ## Sovereign Cloud Stack Security Contact
 
 SCS security contact is <mailto:security@scs.community>, as published on
-<https://sovereigncloudstack.org/.well-known/security.txt>.
+[https://sovereigncloudstack.org/.well-known/security.txt](https://sovereigncloudstack.org/.well-known/security.txt).
 
 ## Version history