Always install python3-cryptography

Instead of python-cryptography.
CentOS 8 Stream was not able to resolve python-cryptography.
We don't need to support old CentOS versions anymore,
so we can use the python3 package.

playbooks/roles/generate_secrets/tasks/generate-cert.yml

@@ -2,19 +2,11 @@
 # SPDX-License-Identifier: MIT
 
 ---
-- name: Install Python cryptography module
-  ansible.builtin.package:
-    name:
-      - python-cryptography
-  become: true
-  when: (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "7")
-
 - name: Install Python cryptography module
   ansible.builtin.package:
     name:
       - python3-cryptography
   become: true
-  when: (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "8")
 
 - name: Generate OpenSSL private keys
   openssl_privatekey: