6.10.0

Aligning to ESP8266 Arduino core, there: "BREAKING: Add Print::availableForWrite method (#7658)"

According to https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/gpio.html,
GPIOs from 36 to 39 can be utilized for output on ESP32-S2, but there are issues with IRQ and internal pullups. Hence, GPIOs 34 and 35 must
be set to blocked for Rx to avoid conflicting use of the input w/ pullup mode that's used.
Inspired by, half-way fixes #182