Update dependency go to 1.26

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
go	uses-with	minor	1.25 → 1.26

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Release Notes

actions/go-versions (go)

v1.26.1: 1.26.1

Compare Source

Go 1.26.1

v1.26.0: 1.26.0

Compare Source

Go 1.26.0

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[gardener-prow]

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