Add --prune option to conda env update

Update conda environment command to include --prune option.

Author: LynnHo

.zshrc

@@ -546,7 +546,8 @@ update_tools()(
 update_tools_stable()(
     (timeout 10 wget -o /dev/stdout -O $WS/.tools_tmp.yml https://raw.githubusercontent.com/LynnHo/Make-Workspace/main/tools_stable.yml || \
      timeout 10 wget -o /dev/stdout -O $WS/.tools_tmp.yml https://gitee.com/LynnHo/Make-Workspace/raw/main/tools_stable.yml) && \
-    conda env update --name tools --file $WS/.tools_tmp.yml
+    # conda env update --name tools --file $WS/.tools_tmp.yml
+    conda env update --name tools --file $WS/.tools_tmp.yml --prune
     chmod +x $TOOL_HOME/bin/{ping,ping6}
     rm -f $WS/.tools_tmp.yml