.github/workflows: force go to 1.23 for the lint job

[vdemeester]

Changes

As of a few days ago, stable means 1.24. And the current version of
golangci-lint does crash with it. So let's force go 1.23 for now.

/kind misc

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[vdemeester]

@afrittoli @waveywaves

[abayer]

/approve
/lgtm

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