[patch] Added custom 9.1.x-dev channel

Author: Shyam Doshi

src/mas/devops/data/catalogs/v9-facilities-dev-amd64.yaml

@@ -51,6 +51,7 @@ mas_core_version:
 mas_facilities_version:
   9.2.x-stable: 9.2.0-pre.stable_29422
   9.2.x-feature: 9.2.0-pre.stable_16853
+  9.1.x-dev: 9.1.12-pre.maint91xdev-29259
   9.1.x: 9.1.11
 
 mas_assist_version: