refactor: replace deprecated ansible_* variables with ansible_facts

Replace deprecated ansible_hostname and ansible_architecture variables
with their ansible_facts equivalents to follow current Ansible best
practices and ensure future compatibility

Author: elasticroentgen

roles/bootstrap/templates/motd.j2

@@ -4,7 +4,7 @@
 cat <<'EOF_HEADER'
 ******************************************************************
 
-Hello, this is {{ ansible_hostname }}.
+Hello, this is {{ ansible_facts['hostname'] }}.
 
     ___________________          _-_
     \==============_=_/ ____.---'---`---.____

roles/openbao_agent/tasks/main.yml

@@ -7,7 +7,7 @@
     update_cache: true
 - name: Set architecture mapping
   ansible.builtin.set_fact:
-    openbao_agent_arch: "{{ 'amd64' if ansible_architecture == 'x86_64' else 'arm64' if ansible_architecture == 'aarch64' else ansible_architecture }}"
+    openbao_agent_arch: "{{ 'amd64' if ansible_facts['architecture'] == 'x86_64' else 'arm64' if ansible_facts['architecture'] == 'aarch64' else ansible_facts['architecture'] }}"
 - name: Download OpenBao GPG key
   ansible.builtin.get_url:
     url: https://openbao.org/assets/openbao-gpg-pub-20240618.asc

roles/teleport_agent/templates/teleport-config.yml.j2

@@ -1,6 +1,6 @@
 version: v3
 teleport:
-  nodename: {{ ansible_hostname }}
+  nodename: {{ ansible_facts['hostname'] }}
   data_dir: /var/lib/teleport
   join_params:
     token_name: {{ teleport_agent_token }}