ModuleNotFoundError exception rendering API schema under Python 3.9+

[jeremystretch]

NetBox version

v3.3.5

Python version

3.9

Steps to Reproduce

1. Install NetBox using Python 3.9 or later
2. Visit /api/docs/?format=openapi to render the raw API schema

Expected Behavior

The schema should render successfully.

Observed Behavior

A ModuleNotFoundError exception is raised. This appears to be due to a conflict introduced by swagger-spec-validator v3.0.0 under Python 3.9 or later.

[tijuca]

The underlying upstream issue in swagger_spec_validator has been fixed by adding the missed required additional package dependency.
Yelp/swagger_spec_validator@1e10f01

There is now a new version 3.0.3 available which has included that fix. I'm using a local instance of NetBox 3.3.6 which is working fine with a by me patched swagger_spec_validator package.