current_voltage measurement in stats.sh may be off

[According to SkatterBencher on Twitter](https://x.com/skatterbencher/status/1818510442526015625?s=43):

> The SOC can request >1.1V but the PMIC `v_out` will be limited to 1.1V
>
> "vcgencmd measure_volts arm" returns the SOC requested voltage
>
> "vcgencmd pmic_read_adc" `VDD_CORE_V` returns PMIC voltage out
>
> `measure_volts` can be anything you want, but `VCC_CORE_V` won't exceed 1.1V

Because of this, it might be good to change how [current_voltage](https://github.com/geerlingguy/pi-overvolt/blob/master/stats.sh#L4) is determined in stats.sh.