(CAT-2385) Fix apt and systemd dependency issue

Author: shubhamshinde360

.fixtures.yml

@@ -1,7 +1,9 @@
 ---
 fixtures:
   repositories:
-    apt: "https://github.com/puppetlabs/puppetlabs-apt.git"
+    apt:
+      repo: 'https://github.com/puppetlabs/puppetlabs-apt.git'
+      ref: v10.0.1
     augeas_core: "https://github.com/puppetlabs/puppetlabs-augeas_core.git"
     concat: "https://github.com/puppetlabs/puppetlabs-concat.git"
     cron_core: "https://github.com/puppetlabs/puppetlabs-cron_core.git"
@@ -11,4 +13,6 @@ fixtures:
     puppet_agent: 'https://github.com/puppetlabs/puppetlabs-puppet_agent.git'
     stdlib: "https://github.com/puppetlabs/puppetlabs-stdlib.git"
     yumrepo_core: "https://github.com/puppetlabs/puppetlabs-yumrepo_core.git"
-    systemd: "https://github.com/voxpupuli/puppet-systemd.git"
+    systemd:
+      repo: "https://github.com/voxpupuli/puppet-systemd.git"
+      ref: 8.3.1