Graham Christensen 5c3e48fd0d CliRunners: decode UTF8 before printing stderr/stdout
Fixes yath output. It used to say:

    step â is now runnable

Now it says:

    step ‘/run...2ipqz6hbc41m4c5w5bkq-dependent-job.drv’ is now runnable
2022-01-21 15:24:33 -05:00
..
2022-01-11 10:17:14 -05:00