Bump ISO Go version back up to 1.20 after buildroot fix

[spowelljr]

Bumped Go version back down to 1.19.5 from 1.20 due in 3006b3e due to https://lore.kernel.org/buildroot/CA+h8R2rtcynkCBsz=_9yANOEguyPCOcQDj8_ns+cv8RS8+8t9A@mail.gmail.com/T/

[XDRAGON2002]

@spowelljr Hi, I'm a new contributor and would like to resolve this issue, just wanted to confirm if the reason for downgrading has been resolved, i.e. is it okay to open a PR bumping up the version now?

/assign

[spowelljr]

I don't believe that buildroot has released a new version yet so I don't think any action is able to be taken yet.

https://buildroot.org/news.html

The required PR will have to bump the buildroot version and Go version in tandem.

[XDRAGON2002]

Sure, I'll keep this issue on a tracking thread then.

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