Describe the bug
When from typing import TypeAlias is used in the output models, it does not take into consideration that support for this was introduced in python 3.10. Any versions below 3.10 will generate models that will not work.

The potential solution would be to use `from typing_extensions import TypeAlias

To Reproduce

Example schema:

type DummyType {
    id: ID!
    label: String!
    value: Int!
}

Used commandline:

$ datamodel-codegen --input ./example.graphql --input-file-type=graphql --output-model-type pydantic_v2.BaseModel --target-python-version 3.8 --output example_models.py

Expected behavior
The outputted example_models.py should be code that can be run using python3.8.

Version:

• OS: [e.g. iOS] Mac OS 14, aws lambda runtime
• Python version: 3.8
• datamodel-code-generator version: [e.g. 22] 0.25.3

Additional context
Add any other context about the problem here.