Update go module directive to v1.26.3

[gardener-ci-robot]

This PR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.25.7 → 1.26.3

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[coderabbitai]

📝 Walkthrough

Walkthrough

The Go module toolchain version requirement is updated from 1.25.7 to 1.26.3. The module path, dependencies, and all other go.mod content remain unchanged.

Changes

Go Toolchain Version

Layer / File(s)	Summary
Go Version Update go.mod	Go directive updated from go 1.25.7 to go 1.26.3.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• holgerkoser
• grolu
• petersutter

Poem

🐰 A version bump so small and neat,
From 1.25 to 1.26 complete!
Go forth with tools both fresh and bright,
The toolchain dances in the light! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is auto-generated by Mend Renovate and lacks required template sections including area categorization, kind categorization, issue reference, and release notes.	Fill in the required template sections: select /area and /kind identifiers, link to any related issues with 'Fixes #', add special notes if needed, and provide a release note or mark as NONE.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating the Go module directive version in go.mod from 1.25.7 to 1.26.3.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/go-1.x

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