[BUG] [python-nextgen] Invalid "authors" field in pyproject.toml

[ditsuke]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The pyproject.toml generated by the python-nextgen generator is invalid per the pyproject spec:

Invalid author string. Must be in the format: John Smith <[email protected]>

openapi-generator version

6.5.0

OpenAPI declaration file content or url

Use petstore.yaml

Generation Details

openapi-generator-cli generate -g python-nextgen -i petstore.yaml -o p

Steps to reproduce

1. Generate client code with python-nextgen
2. Validate pyproject.toml, either by running poetry install or through a YAML schema validator etc.

Related issues/PRs

Suggest a fix

Use format per spec.