To adopt avrdude 7.2

[mcuee]

It would be good to adopt avrdude 7.1 release in the future version of ATTinyCore.

FYI: MicroCore has adopted avrdude 7.1
MCUdude/MicroCore@0d4e69a
MCUdude/MicroCore@3730418

[mcuee]

Binary release from Arduino avrdude-packing project.
https://github.com/arduino/avrdude-packing/releases/tag/7.1-arduino.1

[MCUdude]

Avrdude 7.1 also has support for the Micronucleus bootloader, which means that with 7.1 you can (again) use Avrdude to deal with everything upload related.

This is a good thing because it means that you don't have to handle chips running the Micronucleus bootloader with a separate tool.

It would be cool if ATtinyCore 2.0.0 used Avrdude 7.1, Urboot instead of Optiboot, and Avrdude instead of Micronucleus.

[mcuee]

Arduino avrdude-packing project has released their version of Arduino 7.2, which should be suitable for the usage here.
https://github.com/arduino/avrdude-packing/releases/tag/7.2-arduino.1

[mcuee]

avrdude 7.3 has been released.
https://github.com/avrdudes/avrdude/releases/tag/v7.3