[Bug]: Step CA 0.30.2 send malformed JSON reply for order list

[hfp-is-owner]

Steps to Reproduce

• use Step CA as ACME server
• request the order list according to RFC8555 section 7.1.2.1 (https://www.rfc-editor.org/rfc/rfc8555#section-7.1.2.1).
• JSON returned is "[]"

Your Environment

• OS - Gentoo Linux
• step-ca Version - 0.30.2
• ACME client is a private Go application that uses the https://pkg.go.dev/golang.org/x/crypto/acme lib

Expected Behavior

the RFC describes a different format: an empty order list should be {"orders": []}

Actual Behavior

JSON returned is "[]"

Additional Context

No response

Contributing

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