chore: upgrade golangci-lint to 2.1.6

[slashpai]

What this PR does / why we need it:

Upgrade golangci-lint to 2.1.16
https://golangci-lint.run/product/migration-guide

I believe this could fix the verify test that gets hang currently

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[k8s-ci-robot]

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[slashpai]

This file was updated running the command golangci-lint migrate as mentioned in https://golangci-lint.run/product/migration-guide/

[slashpai]

cc @dgrisonnet @RainbowMango

[RainbowMango]

Seems we met some failing checks need to be resolved:

func parseContainerCpuMetrics(namespaceName apitypes.NamespacedName, containerName string, timestamp int64, value float64, pods map[apitypes.NamespacedName]storage.PodMetricsPoint) {
     ^
pkg/storage/storage_benchmark_test.go:235:2: ST1003: struct field cumulativeCpuUsed should be cumulativeCPUUsed (staticcheck)
	cumulativeCpuUsed uint64
	^
pkg/storage/types.go:48:2: ST1003: struct field CumulativeCpuUsed should be CumulativeCPUUsed (staticcheck)
	CumulativeCpuUsed uint64
	^
test/e2e_test.go:378:2: ST1003: var reqUrl should be reqURL (staticcheck)
	reqUrl := url.URL{Scheme: scheme, Path: path, RawQuery: query, Host: fmt.Sprintf("127.0.0.1:%d", localPort)}
	^

[slashpai]

These are updated as per lint checks but I wanted to check with @dgrisonnet if this is ok and mention as change in changelog or we want to continue old name itself

[dgrisonnet]

it is ok, metrics-server is not meant to be used as a library

[slashpai]

/assign @dgrisonnet @RainbowMango

[dgrisonnet]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgrisonnet, slashpai

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