[3.4] Update go version to 1.20.12

[jonasrdl]

Updates go version to 1.20.12 for release-3.4

#17049

[k8s-ci-robot]

Hi @jonasrdl. 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.

I understand the commands that are listed here.

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.

[ahrtr]

Suggested change

	1.21.5
	1.20.12

[ahrtr]

Suggested change

	go 1.21
	go 1.20

[jmhbnz]

Thanks for raising this @jonasrdl, apologies I neglected to mention in the github issue that release branches are to go to 1.20.12 not 1.21.5.

There are a few more mentions to update in this branch before we merge:

 james  ~  Documents  etcd  ?2  release-3.4-updat..                                                                                                        08:02:17 
 ➜ git grep 1.20.11
Makefile:GO_VERSION ?= 1.20.11
functional/scripts/docker-local-agent.sh:  GO_VERSION=1.20.11
functional/scripts/docker-local-tester.sh:  GO_VERSION=1.20.11

[jmhbnz]

/ok-to-test

[jonasrdl]

Thanks for the hint @jmhbnz all should be updated now :)

[jmhbnz]

LGTM on workflow green - Thanks @jonasrdl

[ahrtr]

Please also update the changelog for both 3.4 and 3.5. Thanks.

[jonasrdl]

@ahrtr should I edit it here https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.4.md?plain=1#L23 ? Or add a new section for a new patch version (3.4.29?)

[ahrtr]

@ahrtr should I edit it here https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.4.md?plain=1#L23 ? Or add a new section for a new patch version (3.4.29?)

3.4.28 is already out. Please add a new section for 3.4.29, thanks.