Update Mjolnir (v0.1.17 -> v0.1.18)

roles/matrix-bot-mjolnir/defaults/main.yml

@@ -2,7 +2,7 @@
 # See: https://github.com/matrix-org/mjolnir
 
 matrix_bot_mjolnir_enabled: true
-matrix_bot_mjolnir_version: "v0.1.17"
+matrix_bot_mjolnir_version: "v0.1.18"
 matrix_bot_mjolnir_docker_image: "{{ matrix_container_global_registry_prefix }}matrixdotorg/mjolnir:{{ matrix_bot_mjolnir_version }}"
 matrix_bot_mjolnir_docker_image_force_pull: "{{ matrix_bot_mjolnir_docker_image.endswith(':latest') }}"