Update ghcr.io/matrix-org/rageshake Docker tag to v1.15.0

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

@@ -24,7 +24,7 @@ matrix_rageshake_path_prefix: /
 # There are no stable container image tags yet.
 # See: https://github.com/matrix-org/rageshake/issues/69
 # renovate: datasource=docker depName=ghcr.io/matrix-org/rageshake
-matrix_rageshake_version: 1.14.0
+matrix_rageshake_version: 1.15.0
 
 matrix_rageshake_base_path: "{{ matrix_base_data_path }}/rageshake"
 matrix_rageshake_config_path: "{{ matrix_rageshake_base_path }}/config"