uplift client-go to 0.20.0

[tuminoid]

k8s.io/client-go has vulnerability GO-2021-0064, which is fixed in 0.20.0. While the newest client-go is 0.26.0, do only minimal uplift.

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[tuminoid]

/hold

[tuminoid]

/hold cancel

[tuminoid]

/unhold

[kashifest]

We should probably uplift go itself here, go1.16 is very old and probably have far more vulnerabilities.

[tuminoid]

We should probably uplift go itself here, go1.16 is very old and probably have far more vulnerabilities.

True, but it is separate issue from this. This repository is also very inactive, so it should be agreed first if we should keep maintaining it in the first place.