Make regex case-insensitive

is-reboot-required.sh

@@ -4,7 +4,7 @@ set -euo pipefail
 IFS=$'\n\t'
 
 RUNNING_VERSION=$(uname -r)
-FS_VERSION=$(file /boot/vmlinuz-linux | sed -rn 's/.* version ([0-9\.A-Z-]+) .*/\1/p')
+FS_VERSION=$(file /boot/vmlinuz-linux | sed -rn 's/.* version ([0-9\.A-Z-]+) .*/\1/pi')
 
 if [ ! "${RUNNING_VERSION}" = ${FS_VERSION} ]; then
     echo "Reboot required."