chore: bump Go toolchain to 1.27.3 for GO-2026-6809

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Andrea Nodari2w ago

govulncheck reports GO-2026-6809 (crypto/x509 now distrusts compromised intermediate certificates) as called on go1.27.2, through TLS verification on HTTPS remotes. go1.27.3 fixes it.

Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_015oS6W9qjGMVnrTz5r8EwDL Entire-Checkpoint: 01M5FF7ZZ5YMZ1MXS08K6CFJYY