[Bug]: Proxy logs `unknown` cert_version when completing HTTP request handler

[ethenotethan]

Jul  3 05:28:05.550 INF server/handlers_cert.go:210 Processed request method=POST url=/put commitmentMode=standard certVersion=2 cert=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

Jul  3 05:28:05.550 INF middleware/logging.go:43 request completed method=POST url="/put?commitment_mode=standard" commitment_mode=standard cert_version=unknown status=200 duration=1.349458ms