Renames apt version checks in FPF repo install

We're no longer upgrading apt in this logic, we're simply ensuring that
the apt version meets spec before proceeding with the installation.

(cherry picked from commit 87f286b)

Author: Conor Schaefer

install_files/ansible-base/roles/install-fpf-repo/tasks/main.yml

@@ -1,5 +1,5 @@
 ---
-- include: upgrade_apt.yml
+- include: validate_apt_version.yml
 
 - name: Install SecureDrop apt repo GPG signing key.
   apt_key: