fix: follow RFC 9116, Section 2.2 (#3)

Author: hamzaremmal

.well-known/security.txt

@@ -1,4 +1,4 @@
 Contact: mailto:[email protected]
 Expires: 2026-04-01T00:00:00.000Z
 Preferred-Languages: en
-Canonical: https://workshop.scala-lang.org/.well-known/security.txt
+Canonical: https://workshop.scala-lang.org/.well-known/security.txt