fix(deps): update rust crate rppal to v0.22.1

This MR contains the following updates:

Package	Type	Update	Change
rppal	dependencies	minor	0.17.1 -> 0.22.1

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Release Notes

golemparts/rppal (rppal)

v0.22.1

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• Update example documentation to be compatible with both older and newer Pi models.

v0.22.0

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• Pwm: (Breaking change) Add support for Pwm2 and Pwm3.
• Pwm: On Raspberry Pi 5 and later models, the PWM channel mapping has changed to be consistent with sysfs numbering. Pwm0 = GPIO12, Pwm1 = GPIO13, Pwm2 = GPIO18, Pwm3 = GPIO19.
• Pwm: Add with_pwmchip to address PWM channels outside of the default configuration.

v0.21.0

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• Add support for Raspberry Pi Compute Module 5 Lite.
• Add support for Raspberry Pi 500.
• Pwm: (Breaking change) Add InvalidChannel error.
• Pwm: Add TryFrom<u8> implementation for Channel.

v0.20.0

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• 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.

v0.19.0

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• Gpio: Add Event struct, containing interrupt event details.
• Gpio: (Breaking change) Add optional debounce argument to set_interrupt() and set_async_interrupt().
• Gpio: (Breaking change) Return an Event struct when an interrupt is triggered, instead of Level.

v0.18.0

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• Gpio: (Breaking change) Add support for mode Null for uninitialized (FUNCSEL 31 (NULL)) pins on Raspberry Pi 5 (contributed by @​lukeburong).
• Gpio: Fix InputPin mode not getting set correctly for uninitialized pins on Raspberry Pi 5 (contributed by @​lukeburong).
• Pwm: (Breaking change) Add Error::UnknownModel.
• Pwm: Fix support for hardware PWM on Raspberry Pi 5, caused by incorrect PWM chip/channel.

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