[DO NOT MERGE]Update Coturn 4.5.2-r12 -> 4.5.2-r13

**no docker tag yet**, [keep an eye on it](https://hub.docker.com/r/coturn/coturn/tags?page=1&name=4.5.2-r13)

roles/matrix-coturn/defaults/main.yml

@@ -8,7 +8,7 @@ matrix_coturn_container_image_self_build_repo: "https://github.com/coturn/coturn
 matrix_coturn_container_image_self_build_repo_version: "docker/{{ matrix_coturn_version }}"
 matrix_coturn_container_image_self_build_repo_dockerfile_path: "docker/coturn/alpine/Dockerfile"
 
-matrix_coturn_version: 4.5.2-r12
+matrix_coturn_version: 4.5.2-r13
 matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_name_prefix }}coturn/coturn:{{ matrix_coturn_version }}-alpine"
 matrix_coturn_docker_image_name_prefix: "{{ 'localhost/' if matrix_coturn_container_image_self_build else matrix_container_global_registry_prefix }}"
 matrix_coturn_docker_image_force_pull: "{{ matrix_coturn_docker_image.endswith(':latest') }}"