fix: update MySQL image to use the latest stable version

server/docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   mysql:
-    image: mysql:8.0
+    image: mysql:lts
     environment:
       MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
       MYSQL_DATABASE: ${MYSQL_DATABASE:-emly_bugreports}