Incorrect sudo permission judgment logic

Reason: command -v sudo only determines whether the command exists, not whether sudo is available.

ref/upgrade_bash.sh

@@ -24,7 +24,7 @@ upgrade_bash() {
     else
         if [ -f /etc/os-release ]; then
             . /etc/os-release
-            if [ $(id -u) -ne 0 ] && ! command -v sudo >/dev/null 2>&1; then
+            if [ $(id -u) -ne 0 ] && ! sudo -v >/dev/null 2>&1; then
                 echo "Error: You need sudo privileges to upgrade Bash."
                 exit 1
             fi