[release-0.5] Update go version to 1.16.15

[ialidzhikov]

What this PR does / why we need it:
The motivation for this change is to make image scanning tools happy as they currently report a lot of CVEs for the metrics-server due to the outdated go version:

CVE-2021-44717
CVE-2022-28327
CVE-2022-24675
CVE-2022-29526
CVE-2022-30635
CVE-2022-30632
CVE-2022-30630
CVE-2022-32148
CVE-2022-30633
CVE-2022-28131
CVE-2022-30580
CVE-2022-29804
CVE-2022-30634
CVE-2022-30631
CVE-2022-32189

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
N/A but fixes a lot of CVEs reported by image scanning tools

[k8s-ci-robot]

Hi @ialidzhikov. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[yangjunmyfm192085]

/ok-to-test

[yangjunmyfm192085]

same with #1071
I'll resolve this issue

[yangjunmyfm192085]

Now we can rebase and merge this pr

[yangjunmyfm192085]

@ialidzhikov

[ialidzhikov]

/retest

[yangjunmyfm192085]

/assign @serathius

[serathius]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ialidzhikov, serathius

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[yangjunmyfm192085]

/lgtm