Update golang Docker tag to v1.23.4

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	patch	1.23.3 -> 1.23.4

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This PR has been generated by Renovate Bot.

[gardener-robot]

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[gardener-prow]

@gardener-ci-robot: The following test 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-extension-networking-cilium-e2e-kind	174cc06	link	true	/test pull-extension-networking-cilium-e2e-kind

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