Try `versioning=loose` for the Coturn container image definition for Renovate

Ref: https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/4880#issuecomment-3807433691

roles/custom/matrix-coturn/defaults/main.yml

@@ -25,7 +25,7 @@ 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"
 
-# renovate: datasource=docker depName=coturn/coturn
+# renovate: datasource=docker depName=coturn/coturn versioning=loose
 matrix_coturn_version: 4.8.0-r0
 matrix_coturn_docker_image: "{{ matrix_coturn_docker_image_registry_prefix }}coturn/coturn:{{ matrix_coturn_version }}-alpine"
 matrix_coturn_docker_image_registry_prefix: "{{ 'localhost/' if matrix_coturn_container_image_self_build else matrix_coturn_docker_image_registry_prefix_upstream }}"