Add support for Fastify-sensible errors

[simonecorsi]

The error handler of the plugin uses a property on the error object to decide if it should redact the message. I think it's nice to check for the same property and add support for the plugin errors:

https://github.com/fastify/fastify-sensible/blob/48ef8a00ef7b9396a538711b58e7d09b410e1025/index.js#L47

[simonecorsi]

🎉 This issue has been resolved in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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