Updating github-config (#740)

Author: paketo-bot

scripts/.util/tools.json

@@ -1,6 +1,6 @@
 {
   "createpackage": "v1.73.0",
-  "jam": "v2.14.2",
+  "jam": "v2.15.0",
   "libpaktools": "v0.3.0",
   "pack": "v0.38.2"
 }