Bump Cloudflared to 2026.9.3

[NicolasDorier]

Summary

• Updates Cloudflared to 2026.9.3, including dependency updates and the gRPC fix for GO-2026-6348.
• Updates the Debian 13 distroless runtime to the digest used by the upstream 2026.9.3 image.

References

• https://github.com/cloudflare/cloudflared/releases/tag/2026.9.3
• https://github.com/cloudflare/cloudflared/blob/2026.9.3/Dockerfile

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Reviewing files that changed from the base of the PR and between 519ca6d and 6df5a73.

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• Cloudflared/2026.9.3/Dockerfile

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