[Cake] irtt update to go 1.22

[dave seddon]

G'day,

I'm chasing weird latency spikes in my wifi network, so on Dave T's
suggestion, I'm going to try using irtt to debug it.

I noticed irtt hasn't upgraded its Go version for a long time, and Go has
come a long way since 1.12. While I was there I spotted a bunch of lint
errors, so I just hacked in a quick log.Fatal, but these should probably be
real error exit codes.

https://github.com/heistp/irtt/pull/41

-- 
Regards,
Dave Seddon
+1 415 857 5102
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