Updating golang version to fix a few vulnerabilities

[soorena776]

This fix addresses the following vulnerabilities:

- CVE-2021-38297
- CVE-2021-29923
- CVE-2021-34558
- CVE-2021-36221

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[jkh52]

/ok-to-test

[jkh52]

I realized we have 1.16 in go.mod, we may need to keep consistent: https://github.com/kubernetes-sigs/apiserver-network-proxy/blob/master/go.mod#L3

[cheftako]

I realized we have 1.16 in go.mod, we may need to keep consistent: https://github.com/kubernetes-sigs/apiserver-network-proxy/blob/master/go.mod#L3

+1

[cheftako]

Would also be good to update https://github.com/kubernetes-sigs/apiserver-network-proxy/blob/master/konnectivity-client/go.mod#L3 to at least go1.15 (https://github.com/kubernetes/kubernetes/blob/release-1.20/go.mod#L9)

[soorena776]

@jkh52 @cheftako updated the go.mod go version.

[soorena776]

/retest-required

[soorena776]

looks like 1.17 adds all the hidden dependencies to go.mod, for better visibility.
https://golang.org/doc/go1.17#go-command

[jkh52]

/lgtm

[cheftako]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheftako, soorena776

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