roles/common: Update cache in firewall playbook

cron-apt updates the system against the security-only databases at
night so many packages are "missing" unless you run apt update. We
need to update the cache on all apt tasks actually because I might
be running them by their tag and they currently only get updated at
the beginning of the playbook.

roles/common/tasks/firewall_Debian.yml

@@ -21,7 +21,7 @@
         - python3-systemd
 
   - name: Install firewall packages
-    apt: pkg={{ debian_firewall_packages }} state=present
+    apt: pkg={{ debian_firewall_packages }} state=present cache_valid_time=3600
 
   - name: Start and enable nftables
     when: ansible_distribution_major_version is version('11', '>=')

roles/common/tasks/firewall_Ubuntu.yml

@@ -26,7 +26,7 @@
         - python3-systemd
 
   - name: Install firewall packages
-    apt: pkg={{ ubuntu_firewall_packages }} state=present
+    apt: pkg={{ ubuntu_firewall_packages }} state=present cache_valid_time=3600
 
   - name: Remove ufw
     when: ansible_distribution_version is version('16.04', '>=')