Update libretranslate/libretranslate Docker tag to v1.5.7 (#30111)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.devcontainer/docker-compose.yml

@@ -70,7 +70,7 @@ services:
         hard: -1
 
   libretranslate:
-    image: libretranslate/libretranslate:v1.5.6
+    image: libretranslate/libretranslate:v1.5.7
     restart: unless-stopped
     volumes:
       - lt-data:/home/libretranslate/.local