style: Apply Molecule linting fixes

- Fix YAML formatting in defaults and handlers
- Update meta information formatting
- Improve task syntax consistency

meta/main.yml

@@ -1,3 +1,4 @@
+---
 galaxy_info:
   role_name: bind9
   namespace: valid
@@ -10,18 +11,18 @@ galaxy_info:
 
   license: GPL-3.0-or-later
 
-  min_ansible_version: 2.13
+  min_ansible_version: "2.13"
 
   platforms:
     - name: Ubuntu
       versions:
-        - 22.04
-        - 20.04
+        - jammy
+        - focal
     - name: Debian
       versions:
-        - 11
+        - bullseye
 
-  galaxy_tags: 
+  galaxy_tags:
     - bind9
     - bind
     - dns