fix: validateOutput() when schema contains internal reference

[mtjandra]

Addresses #2364

Summary

Fixes validateOutput(). Root of the issue is that we forgot to update arguments to validateBody when the following change was applied:

• 0f46225#diff-e805a466f9445475fb8d5a7b8af5c70a7203b06cf92390cd0a09c920617a1c9aR162

Checklist

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[chohmann]

Thank you for your contribution!

[chohmann]

This was released in version 5.3.1.