Update go to 1.26 (minor)

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
go	uses-with	minor	1.25 → 1.26
golang	stage	minor	1.25.9 → 1.26.2

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Release Notes

actions/go-versions (go)

v1.26.2: 1.26.2

Compare Source

Go 1.26.2

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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Release note:

The following dependencies have been updated:
- `go` from `1.25.9` to `1.26.2`. [Release Notes](https://redirect.github.com/go/releases/tag/1.26.2)
- `golang` from `1.25.9` to `1.26.2`. 

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