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What type of PR is this?
/kind cleanup
What this PR does / why we need it:
Bump cluster-autoscaler golang version to 1.21.
The Docker build was already using
golang:1.21.3
- it's only the CI and go.mod that was lacking behind.K/K is already on 1.21.3 as well: https://github.com/kubernetes/kubernetes/blob/master/.go-version
With upgrade, I've removed min/max functions, which are now build-in: https://tip.golang.org/ref/spec#Min_and_max
Does this PR introduce a user-facing change?