Use new config to disable OhMyZsh auto update

There's a new method:
https://github.com/ohmyzsh/ohmyzsh/wiki/Settings#deprecated-settings

Author: dhhyi

src/common-utils/main.sh

@@ -558,7 +558,7 @@ if [ "${INSTALL_ZSH}" = "true" ]; then
         # Add devcontainer .zshrc template
         if [ "$INSTALL_OH_MY_ZSH_CONFIG" = "true" ]; then
             if ! [ -f "${template_path}" ] || ! grep -qF "$(head -n 1 "${template_path}")" "${user_rc_file}"; then
-                echo -e "$(cat "${template_path}")\nDISABLE_AUTO_UPDATE=true\nDISABLE_UPDATE_PROMPT=true" > ${user_rc_file}
+                echo -e "$(cat "${template_path}")\nzstyle ':omz:update' mode disabled" > ${user_rc_file}
             fi
             sed -i -e 's/ZSH_THEME=.*/ZSH_THEME="devcontainers"/g' ${user_rc_file}
         fi