[3.4] dependency: update go to 1.20.13

[ivanvc]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.
Upgrades go version to 1.20.13.

Part of #17269.

[k8s-ci-robot]

Hi @ivanvc. Thanks for your PR.

I'm waiting for a etcd-io 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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[jmhbnz]

/retest

[jmhbnz]

Unfortunately our release-3.4 branch still has multiple places where go version is referenced:

 ~  Documents  etcd  ?1  3.4-update-golang-t..  grep -Ri '1\.20\.12'
Makefile:GO_VERSION ?= 1.20.12
functional/scripts/docker-local-tester.sh:  GO_VERSION=1.20.12
functional/scripts/docker-local-agent.sh:  GO_VERSION=1.20.12

Suggest we update those as well, or add a second commit to this pr which makes those three all refer to the single file to fix it for good.

[ivanvc]

Unfortunately our release-3.4 branch still has multiple places where go version is referenced:

 ~  Documents  etcd  ?1  3.4-update-golang-t..  grep -Ri '1\.20\.12'
Makefile:GO_VERSION ?= 1.20.12
functional/scripts/docker-local-tester.sh:  GO_VERSION=1.20.12
functional/scripts/docker-local-agent.sh:  GO_VERSION=1.20.12

Suggest we update those as well, or add a second commit to this pr which makes those three all refer to the single file to fix it for good.

Oops, I missed those ones. I'll update them and will amend my commit.

[jmhbnz]

LGTM on workflow green - thanks @ivanvc

[ahrtr]

lgtm

Thank you!

[jmhbnz]

/retest

[ahrtr]

The linux-amd64-e2e has timed out for 5 times.

Could you take #17241 as a high priority task? @fuweid thx

[fuweid]

Found the root cause and will file pr later.

[fuweid]

FYI, CI is happy right now https://github.com/etcd-io/etcd/actions/runs/7627029235