certbot(role): don't use certbot__version_spec anymore as its not used

roles/certbot/tasks/main/install.yaml

@@ -6,14 +6,6 @@
 
 - name: make sure the `certbot` package is installed
   ansible.builtin.apt:
-    name: certbot={{ certbot__version_spec }}*
-    state: present
-    allow_change_held_packages: true
-    update_cache: true
-  become: true
-
-- name: apt-mark hold `certbot`
-  ansible.builtin.dpkg_selections:
     name: certbot
-    selection: hold
+    state: present
   become: true