fix(modem): Use higher GPIO range to support new chips

We can use IDF's Kconfig.env_caps in future, but that's not available on v5.0.

Closes https://github.com/espressif/esp-protocols/issues/558

components/esp_modem/examples/modem_psm/main/Kconfig.projbuild

@@ -20,14 +20,14 @@ menu "Example Configuration"
         config EXAMPLE_MODEM_UART_TX_PIN
             int "TXD Pin Number"
             default 4
-            range 0 31
+            range 0 56
             help
                 Pin number of UART TX.
 
         config EXAMPLE_MODEM_UART_RX_PIN
             int "RXD Pin Number"
             default 5
-            range 0 31
+            range 0 56
             help
                 Pin number of UART RX.
 
@@ -70,14 +70,14 @@ menu "Example Configuration"
     config EXAMPLE_MODEM_PWRKEY_PIN
         int "PWRKEY Pin Number"
         default 18
-        range 0 31
+        range 0 56
         help
             Pin number connected to modem's power key pin.
 
     config EXAMPLE_MODEM_STATUS_PIN
         int "STATUS Pin Number"
         default 19
-        range 0 31
+        range 0 56
         help
             Pin number connected to modem's status pin.