Update go to 1.21.4

[nckturner]

What this PR does / why we need it:
Update go to 1.21.4

[k8s-ci-robot]

@nckturner: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-aws-iam-authenticator-integration	ee5a89c	link	true	/test pull-aws-iam-authenticator-integration
pull-aws-iam-authenticator-e2e	ee5a89c	link	true	/test pull-aws-iam-authenticator-e2e

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.

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[nckturner]

Weird:

�[38;5;10m•�[0mcould not get token: AccessDenied: User: arn:aws:iam::209411653980:user/dims is not authorized to perform: sts:AssumeRole on resource: arn:aws:iam::209411653980:role/aws-iam-authenticator-test-role-KubernetesAdmin
	status code: 403, request id: 65556482-81f4-4320-9d3b-2411e3362b28

[dims]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, nckturner

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[nckturner]

Test failures should be unrelated, merged.