update the upload artifact action version

Author: gigapod

.github/workflows/build-iotnode-lorawan.yml

@@ -86,7 +86,7 @@ jobs:
           --export-binaries --clean --library `pwd`/SparkFun_IoTNodeLoRaWAN
 
       # Upload the build files - bootloader, paritions, firmware
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: Upload Build
           path: sfeIoTNodeLoRaWAN/build/rp2040.rp2040.sparkfun_iotnode_lorawanrp2350/sfeIoTNodeLoRaWAN.ino.uf2