Generated open api spec nullable fields marked as required causing null exception failures.

[lw-andrewsmith]

Describe the bug Swagger spec is invalid as lots of nullable fields are marked as required this invalidates generation using swagger code gen.

To Reproduce Use https://www.etsy.com/openapi/generated/oas/3.0.0.json at https://editor.swagger.io/ to generate the c# client. Call getUser Endpoint. See Exception when Getting Users

Expected behavior I'm assuming if a field is nullable it can't be required so shouldn't be marked as such. See the User example below, this appears all over the open api spec file.

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