Access to the GPIO via /sys/class/gpio is deprecated

[E5tian]

I know it is only used in the example. But maybe it will help someone who has the same problem as me, that the gateway no longer starts up.

Problem:
At the beginning the SX1301 is reset by accessing GPIO 25, and the following message appears:
"/sys/class/gpio/gpio25/value: No such file or directory"

Solution:
Access the GPIO via pinctrl.
An example to set pin 25 to hight: "pinctrl set 25 dh"

[kskenyon]

The start.sh script needs to be updated this way to use it on Debian 12 on Raspberry Pi OS. Not sure if it needs to be run as root.