[1.20][go1.15] Update to go1.15.7

[cpanato]

What type of PR is this?

/kind feature
/area dependency

What this PR does / why we need it:

Cherry pick of #98363.

• Update to go1.15.7

Tracking issue: kubernetes/release#1851

cc: @kubernetes/release-engineering

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- Kubernetes is now built using go1.15.7

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

@cpanato: This cherry pick PR is for a release branch and has not yet been approved by Release Managers.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved (/lgtm + /approve) by the relevant OWNERS.

AFTER it has been approved by code owners, please ping the kubernetes/release-managers team in a comment to request a cherry pick review.

(For details on the patch release process and schedule, see the Patch Releases page.)

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

@cpanato: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cpanato
To complete the pull request process, please assign lavalamp after the PR has been reviewed.
You can assign the PR to them by writing /assign @lavalamp in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• build/OWNERS
• cluster/addons/fluentd-elasticsearch/OWNERS
• staging/publishing/OWNERS
• staging/src/k8s.io/api/OWNERS
• staging/src/k8s.io/apiextensions-apiserver/pkg/apis/OWNERS
• staging/src/k8s.io/apimachinery/pkg/apis/OWNERS
• staging/src/k8s.io/kubelet/OWNERS
• test/images/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[k8s-ci-robot]

@cpanato: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kubernetes-bazel-test	9f56b4b	link	/test pull-kubernetes-bazel-test
pull-kubernetes-bazel-build	9f56b4b	link	/test pull-kubernetes-bazel-build
pull-kubernetes-e2e-gce-ubuntu-containerd	9f56b4b	link	/test pull-kubernetes-e2e-gce-ubuntu-containerd
pull-kubernetes-e2e-kind	9f56b4b	link	/test pull-kubernetes-e2e-kind
pull-kubernetes-e2e-gce-100-performance	9f56b4b	link	/test pull-kubernetes-e2e-gce-100-performance

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[cpanato]

go 1.15.8 is out will close this in favor of the work started here: kubernetes/release#1895

/close

[k8s-ci-robot]

@cpanato: Closed this PR.

In response to this:

go 1.15.8 is out will close this in favor of the work started here: kubernetes/release#1895

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.