Release 2.5.2

New targets!

Arduino Nicla Sense ME

Libraries

WiFi: Fix Access Point teardown on Portenta
Camera: enable 320x320 resolution
PDM: fix restart on RP2040

Core

Update mbed-os to 6.15.0
Portenta: add menu to configure non standard flash splits between M7 and M4
RP2040: optimize RAM usage
RP2040: fix flash size in linker script