[BUG] [python-nextgen] Generated ApiClient Throws Error With Dict Query Params

Created by: emma-campbell

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 generated ApiClient method parameters_to_url_query converts int, float, and bool values to strings. It does not do the same for dict. As a result passing a dict query param to the client results in the following error.

TypeError: sequence item 1: expected str instance, dict found

Expected output would be to not have this error.

openapi-generator version

Tested against 6.3.0 as well as master.

OpenAPI declaration file content or url

OpenApi Gist Here

Generation Details

./run-in-docker.sh generate -i result_api.json -g python-nextgen -o python-sdk -p disallowAdditionalPropertiesIfNotPresent=false,generateSourceCodeOnly=true,packageName=result_sdk

Steps to reproduce

Generate the client using the CLI options above
Use the output client in a python script

from result_sdk.api.runner_api import RunnerApi
from datetime import datetime, timedelta

api = RunnerApi()

end = datetime.utcnow()
start = end - timedelta(days=5)

filter = {
	"$and": [
		{
			"createdOn": {
				"$lte": end.isoformat()
			}
		},
		{
			"createdOn": {
				"$gte": start.isoformat()
			}
		}
	]
}

results = api.get_runner_results(filter=filter)

print(results)

Error mentioned before will throw on the results = line.

Related issues/PRs

Pretty similar to #14334, but here applying to dict types.

Suggest a fix

I will have a PR shortly for the mustache template.