Upgrade RIDDL to 1.13.1

Bugfix release: fixes ANSI color code parsing in sbt-riddl checkVersion()
and uses direct riddlc commands instead of 'from <conf>' wrapper.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: reid-spencer

project/Dependencies.scala

@@ -4,7 +4,7 @@ import sbt.*
 object V {
   val lang3 = "3.14.0"
   val opentest4j = "1.3.0"
-  val riddl = "1.12.3"
+  val riddl = "1.13.1"
   val scalatest = "3.2.19"
   val scopt = "4.1.0"
   val slf4j = "2.0.4"