Fix CI catalog job error

from https://0xacab.org/varac/platform/builds/12540:

[INFO] Using puppet 3.8.7
[FAILED]  default (compile time: 13.967425463 seconds)

----------------------------------------
Compiled 1 catalogs in 14.0431 seconds (avg: 14.0431 seconds)
1 test cases failed.

 [F] default:
     File[/etc/apt/sources.list] has notify relationship to invalid resource Exec[apt_updated]

1 / 1 FAILED