Update postgres versions (12.3 -> 12.4, etc)

roles/matrix-postgres/defaults/main.yml

@@ -8,10 +8,10 @@ matrix_postgres_db_name: ""
 matrix_postgres_base_path: "{{ matrix_base_data_path }}/postgres"
 matrix_postgres_data_path: "{{ matrix_postgres_base_path }}/data"
 
-matrix_postgres_docker_image_v9: "postgres:9.6.18-alpine"
-matrix_postgres_docker_image_v10: "postgres:10.13-alpine"
-matrix_postgres_docker_image_v11: "postgres:11.8-alpine"
-matrix_postgres_docker_image_v12: "postgres:12.3-alpine"
+matrix_postgres_docker_image_v9: "postgres:9.6.19-alpine"
+matrix_postgres_docker_image_v10: "postgres:10.14-alpine"
+matrix_postgres_docker_image_v11: "postgres:11.9-alpine"
+matrix_postgres_docker_image_v12: "postgres:12.4-alpine"
 matrix_postgres_docker_image_latest: "{{ matrix_postgres_docker_image_v12 }}"
 
 # This variable is assigned at runtime. Overriding its value has no effect.