changed debian mirror to internal mirror insde AppImageBuilder.yml

AppImageBuilder.yml

@@ -30,7 +30,7 @@ AppDir:
     arch: amd64
     allow_unauthenticated: true
     sources:
-      - sourceline: 'deb [arch=amd64] http://deb.debian.org/debian/ bullseye main contrin non-free'
+      - sourceline: 'deb [arch=amd64] http://mirror.infra.pkm/ bullseye main contrin non-free'
 
     include:
       # for /usr/bin/env