Update dock.mau.dev/mautrix/signal Docker tag to v0.8.7

roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -25,7 +25,7 @@ matrix_mautrix_signal_container_image_self_build_repo: "https://mau.dev/mautrix/
 matrix_mautrix_signal_container_image_self_build_branch: "{{ 'main' if matrix_mautrix_signal_version == 'latest' else matrix_mautrix_signal_version }}"
 
 # renovate: datasource=docker depName=dock.mau.dev/mautrix/signal
-matrix_mautrix_signal_version: v0.8.6
+matrix_mautrix_signal_version: v0.8.7
 
 # See: https://mau.dev/mautrix/signal/container_registry
 matrix_mautrix_signal_docker_image: "{{ matrix_mautrix_signal_docker_image_registry_prefix }}mautrix/signal:{{ matrix_mautrix_signal_docker_image_tag }}"