Swap RX and TX pins in UART initialization

Pins were in the wrong order. Thanks `Jeff M` in discord: https://discord.com/channels/327254708534116352/537365702651150357/1448133233647812618

Author: dhalbert

examples/gps_simpletest.py

@@ -17,7 +17,7 @@
 # For other boards set RX = GPS module TX, and TX = GPS module RX pins.
 rx = board.RX  # Change to board.GP4 for Raspberry Pi Pico boards
 tx = board.TX  # Change to board.GP5 for Raspberry Pi Pico boards
-uart = busio.UART(rx, tx, baudrate=9600, timeout=10)
+uart = busio.UART(tx, rx, baudrate=9600, timeout=10)
 
 # for a computer, use the pyserial library for uart access
 # import serial