[Bug]: json formatter is including [Symbol(level)]

[jrodgut-sg]

The problem

I think this is the same issue as #31 but for the json formatter. In the resolution of that one @DABH mentioned at #31 (comment) that it was fixed for prettyprint there, but other formatters might have the same issue. I'm seeing it when using the json formatter, and in the sourcecode at https://github.com/winstonjs/logform/blob/f6248c4ffe22792e59e0159ea1a6ab30b85903df/json.js I am not seeing any reference to LEVEL from triple-beam as the fix made for the other one f6248c4

What version of Logform presents the issue?

v2.5.1

What version of Node are you using?

v18.13.0

If this is a TypeScript issue, what version of TypeScript are you using?

No response

If this worked in a previous version of Logform, which was it?

No response

Minimum Working Example

No response

Additional information

No response

🔎 Search Terms

Symbol(level)