`justfile` does not work on Windows

Trying to run `just run-esp32c6 hello_rgb` on Windows errors with:

```
cargo +stable run --example hello_rgb --features "esp32c6,esp-hal/unstable" --target=riscv32imac-unknown-none-elf --release
error: Recipe `run-esp32c6` could not be run because just could not find the shell: program not found
```

The `cargo` command printed by `just` runs just fine