Release 2.2.0

Core

Allow UART constructors in both PinName and pin number
Fix Arduino.h inclusion in C files
Nano33BLE: Fix pins 0 / 1 not usable as GPIOs
RP2040: fix watchdog behaviour
RP2040: avoid implicit conversion from NinaPin to int (LEDR, LEDG, LEDB) [1]

Libraries

Add Nano33_updateBootloader sketch to support SoftDevices
PDM: Correct default gain for Portenta
PDM: Run clock at 2.08MHz on RP2040
Fix OTA second stage bootloader for Nano RP2040 Connect (SFU)

Examples

MultipleBlinks: fix Nano RP2040 Connect build

[1]
These leds are connected to the ESP32 module, so using them in digitalWrite() is transparent unless the values are cast to int.
In this case, an explicit error will be raised, explaining how to fix the problem,