(Security fix) Update Element 1.9.6 -> 1.9.7

Ref: https://matrix.org/blog/2021/12/13/disclosure-buffer-overflow-in-libolm-and-matrix-js-sdk

roles/matrix-client-element/defaults/main.yml

@@ -7,7 +7,7 @@ matrix_client_element_container_image_self_build_repo: "https://github.com/vecto
 # - https://github.com/vector-im/element-web/issues/19544
 matrix_client_element_container_image_self_build_low_memory_system_patch_enabled: "{{ ansible_memtotal_mb < 4096 }}"
 
-matrix_client_element_version: v1.9.6
+matrix_client_element_version: v1.9.7
 matrix_client_element_docker_image: "{{ matrix_client_element_docker_image_name_prefix }}vectorim/element-web:{{ matrix_client_element_version }}"
 matrix_client_element_docker_image_name_prefix: "{{ 'localhost/' if matrix_client_element_container_image_self_build else matrix_container_global_registry_prefix }}"
 matrix_client_element_docker_image_force_pull: "{{ matrix_client_element_docker_image.endswith(':latest') }}"