Update homeserver.yaml.j2

roles/custom/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -2515,7 +2515,10 @@ password_providers:
     config:
       enabled: true
       mode: {{ matrix_synapse_ext_password_provider_ldap_mode | string | to_json }}
-      uri: {{ matrix_synapse_ext_password_provider_ldap_uri | string|to_json }}
+      uri:
+      {% for key in matrix_synapse_ext_password_provider_ldap_uri %}
+          - {{ key | string | to_json }}
+      {% endfor %}
       start_tls: {{ matrix_synapse_ext_password_provider_ldap_start_tls|to_json }}
       base: {{ matrix_synapse_ext_password_provider_ldap_base | string|to_json }}
       active_directory: {{ matrix_synapse_ext_password_provider_ldap_active_directory|to_json }}