[Uno R4 minima] GPIO open drain mode select bug

For uno minima, when configuring GPIO with pinMode() function, there is a bug when configured using OUTPUT_OPENDRAIN PinMode.

The fix would be to replace line:

https://github.com/arduino/ArduinoCore-renesas/blob/4e60678ad7286a8c74caa966e479e64c0c09de09/cores/arduino/digital.cpp#L16

with:

```cpp
#if UNO
R_IOPORT_PinCfg(NULL, g_pin_cfg[pin].pin, IOPORT_CFG_PORT_DIRECTION_OUTPUT | IOPORT_CFG_NMOS_ENABLE);
```

Start at cores/arduino/digital.cpp line 16 and review the pinMode() path for OUTPUT_OPENDRAIN on the Uno R4 minima. Compare the current configuration with the issue's proposed replacement, then verify that open-drain GPIO mode is selected correctly for the Uno target; the linked pull request is closed, so check the current branch before starting.

Written by the indexing model from the issue text.