Upgrade Go to 1.26.3

[thomasmaas]

Upgrade Go from 1.25.9 to 1.26.3.

Changes:

• go.mod (root): go 1.25.9 -> go 1.26.3
• coredns/plugin/go.mod: go 1.25.9 -> go 1.26.3
• Dockerfile (root): golang:1.25 -> golang:1.26
• coredns/plugin/Dockerfile: golang:1.25 -> golang:1.26

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e09be725-c9f9-48b3-9bb2-5cb66f07a460

📥 Commits

Reviewing files that changed from the base of the PR and between f0ef781 and 5694acb.

📒 Files selected for processing (4)

• Dockerfile
• coredns/plugin/Dockerfile
• coredns/plugin/go.mod
• go.mod

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch upgrade-go-1.26.3

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[thomasmaas]

Needs a rebase once #786 has been merged.