feat(delivery): complete MySQL version-to-package mapping

- 8.0 from Ubuntu archive, 8.4 from MySQL official APT repo
- 5.6/5.7 not supported for now; enforce one MySQL series per host
- Sync Go version whitelist with the playbook package map

ansible/templates/mysql-instance.cnf.j2

@@ -66,7 +66,10 @@ loose-mysqlx=0
 {% if topology == 'mgr_3' %}
 # --- Group Replication (config-ready; runtime bootstrap handled out-of-band) ---
 plugin-load-add=group_replication.so
+{% if mysql_version_value != '8.4' %}
+{# deprecated since 8.0.26 and removed in 8.3+; only inject for older series #}
 transaction-write-set-extraction=XXHASH64
+{% endif %}
 loose-group-replication-group-name={{ mgr_group_name }}
 loose-group-replication-start-on-boot=OFF
 loose-group-replication-local-address={{ ansible_host | default(inventory_hostname) }}:{{ mysql_gr_port_value }}