fix a bug

.github/workflows/update.yml

@@ -34,15 +34,15 @@ jobs:
             echo "Attempt $i/$MAX_RETRIES to download mihomo..."
             if TAG=$(curl -s --fail https://api.github.com/repos/MetaCubeX/mihomo/releases/latest | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/'); then
               echo "Latest mihomo version: $TAG"
-              if curl -L --fail -o mihomo.tar.gz "https://github.com/MetaCubeX/mihomo/releases/download/${TAG}/mihomo-linux-amd64-${TAG}.tar.gz"; then
+              if curl -L --fail -o mihomo.gz "https://github.com/MetaCubeX/mihomo/releases/download/${TAG}/mihomo-linux-amd64-${TAG}.gz"; then
                 echo "Download succeeded"
-                if tar -xzf mihomo.tar.gz; then
+                if gzip -d mihomo.gz; then
                   chmod +x mihomo
-                  rm -f mihomo.tar.gz
+                  rm -f mihomo.gz
                   echo "mihomo extracted and ready"
                   exit 0
                 else
-                  echo "Failed to extract mihomo.tar.gz"
+                  echo "Failed to extract mihomo.gz"
                 fi
               else
                 echo "Download failed (HTTP error)"