v0.20.0

• Add support for Raspberry Pi Compute Module 5.
• Gpio: Add set_bias to InputPin (contributed by @KronsyC).
• Gpio: Add shared state button example (contributed by @CosminPerRam).
• Spi: Fix embedded HAL SimpleHalSpiDevice transactions to keep CS low between operations (contributed by @whatisbyandby).
• Spi: (Breaking change) Change SimpleHalSpiDevice::new() to require an Spi instance, instead of a generic HAL bus (contributed by @whatisbyandby).
• Uart: Check if /dev/ttyAMA0 exists and fall back to /dev/serial0 when calling new() on Raspberry Pi 5 or Compute Module 5.