Fix missing fetch command in upgrade script

production/mempool-upgrade-all

@@ -20,6 +20,7 @@ update_repo()
     echo "[*] Upgrading ${site} to ${REF}"
     cd "$HOME/${site}" || exit 1
 
+    git fetch origin || exit 1
     for remote in mempool MiguelMedeiros knorrium;do
         git remote add "${remote}" "https://github.com/${remote}/mempool" >/dev/null 2>&1
         git fetch "${remote}" || exit 1