fix: update Go to 1.25.9 to address stdlib vulnerabilities

[dacrab]

Fixes 3 critical vulnerabilities in Go standard library:

• GO-2026-4947: Unexpected work during chain building in crypto/x509
• GO-2026-4946: Inefficient policy validation in crypto/x509
• GO-2026-4870: Unauthenticated TLS 1.3 KeyUpdate DoS in crypto/tls

All vulnerabilities are fixed in Go 1.25.9.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d004bc54-ac30-4582-a471-ee1d7e194fd7

📥 Commits

Reviewing files that changed from the base of the PR and between 9981e78 and c19ea21.

📒 Files selected for processing (1)

• go.mod

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/go-1.25.9-vulns

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