Update riot-web (0.17.0 -> 0.17.3)

roles/matrix-server/defaults/main.yml

@@ -146,7 +146,7 @@ matrix_docker_image_postgres_latest: "{{ matrix_docker_image_postgres_v10 }}"
 
 matrix_docker_image_synapse: "matrixdotorg/synapse:v0.33.7"
 matrix_docker_image_nginx: "nginx:1.15.5-alpine"
-matrix_docker_image_riot: "avhost/docker-matrix-riot:v0.17.0"
+matrix_docker_image_riot: "avhost/docker-matrix-riot:v0.17.3"
 matrix_docker_image_goofys: "cloudproto/goofys:latest"
 matrix_docker_image_coturn: "instrumentisto/coturn:4.5.0.8"
 matrix_docker_image_mailer: "panubo/postfix:latest"