[BUG][Python] python-fastapi 7.9.0 generator fails to generate types for enum schemas

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?
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Description

Generator returns boilerplate without any declaration of schema type if it's an enum.

openapi-generator version

7.9.0

OpenAPI declaration file content or url

components:
  schemas:
    uuid:
      title: UUID
      type: string
    contentformat:
      title: Content Format
      type: string
      description: Identifies the content format for a flow or source using a URN string.
      enum:
        - 'urn:x-nmos:format:video'
        - 'urn:x-nmos:format:audio'
        - 'urn:x-nmos:format:data'
        - 'urn:x-nmos:format:multi'

Generation Details

This is the output I get in the functions generated using contentformat schema:

format:  = Query(None, description="Filter on flow format.", alias="format"),

whereas I would expect

format: str = Query(None, description="Filter on flow format.", alias="format"),

It also doesn't declare the type anywhere else in the generated function. If you get rid of the enum property from the schema it generates as expected.

Steps to reproduce

build-server-local-fastapi:
	docker run --user ${USER}:${GROUP} --rm \
                   -v ${PWD}:/local openapitools/openapi-generator-cli:v${GEN_VER} generate \
				   --additional-properties=apiNameSuffix=controller_impl \
                   -t /local/.templates/7.9.0/python_fastapi/.openapi-generator-server/ \
                   -i /local/openapi.yaml \
                   -g python-fastapi \
                   -o /local/python_fastapi/

Reproduce the issue with the Docker command using openapi.yaml and the python-fastapi generator, then inspect the custom template path .templates/7.9.0/python_fastapi/.openapi-generator-server/. Done means generated functions declare enum-schema parameters as str, such as format: str = Query(...), rather than leaving the type blank.