[BUG] [PYTHON] Duplicate parameter name causes syntax error

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

When generating a client from the OpenAPI file below using the Python generator,
the constructor of a class has both a parameter named args, and a parameter named
*args.

This causes a syntax error.

What I expected: Either an error to be raised, or the none *args parameter to be
renamed to ensure uniqueness.

What happened: The client was generated 'successfully' but at run time I receive
a runtime error

openapi-generator version

5.0.0

OpenAPI declaration file content or url

https://raw.githubusercontent.com/ory/sdk/b8fc063b15e81ae73f824fa23345a372008142ed/spec/hydra/v1.9.2.json

Generation Details

projectName: ory-${PROJECT}-client
packageName: ory_${PROJECT}_client
packageVersion: $VERSION
library: urllib3
packageUrl: https://github.com/ory/sdk

source: https://github.com/ory/sdk/blob/b8fc063b15e81ae73f824fa23345a372008142ed/config/client/python.yml

Steps to reproduce

git clone https://github.com/ory/sdk.git && cd sdk 
openapi-generator-cli generate -i "spec/hydra/v1.9.2.json" \
    -g python-flask \
    -o python-client-output \
    --git-user-id x \
    --git-repo-id x \
    --git-host github.com \
    -c ./config/client/python.yml

Related issues/PRs

This was originally reported at ory/sdk as https://github.com/ory/sdk/issues/56

Suggest a fix

The Python-flask server generator appears to have a parameter ensureUniqueParameters
which sounds like this type of thing this may require.

Reproduce the issue with the linked Hydra OpenAPI declaration and the shown openapi-generator command using the Python generator. Start by comparing Python-flask handling of ensureUniqueParameters with the generated constructor parameters. Done means the generator either reports the duplicate parameter or produces valid Python with unique parameter names, backed by a regression test.