Add support for ESP32-C6 #4
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This is required for successful compilation on Rust 1.74, as `Atomic*64` types are no longer available on `riscv32*-esp-espidf` targets and were used in `esp-idf-hal` before version 0.42.4.
This updates ESP-IDF to v5.1 providing support for ESP32-C6. Additionally, it is necessary to specify the target MCU type as the build script defaults to ESP32-H2 otherwise.
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This adds support for ESP32-C6 by bumping the ESP-IDF version to v5.1 and providing the required MCU environment variable.
Also, this fixes the compilation on Rust 1.74 by bumping the ESP-IDF Rust dependencies (fixes #3).
Unfortunately, I can only test this on ESP32-C3 and ESP32-C6 hardware, but at least building for the Xtensa targets still works on my machine.