Update actions/setup-go action to v6

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-go	action	major	v5 → v6

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Release Notes

actions/setup-go (actions/setup-go)

v6

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[gardener-prow]

@gardener-ci-robot: 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-dependency-watchdog-unit	406b096	link	true	/test pull-dependency-watchdog-unit
pull-dependency-watchdog-e2e-kind	406b096	link	true	/test pull-dependency-watchdog-e2e-kind

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see our testing guideline for how to avoid and hunt flakes.

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