### Apache Airflow version

2.5.1

### What happened

Context: I am attempting to use [TypedDict](https://docs.python.org/3/library/typing.html#typing.TypedDict) objects to maintain the keys used in DAG params in a single place, and check for key names across multiple DAGs that use the params.
This raises an error with `mypy` as `params` expects an `Optional[Dict]`. Due to the invariance of `Dict`, this does not accept `TypedDict` objects.

What happened: I passed a `TypedDict` to the `params` arg of `DAG` and got a TypeError.

### What you think should happen instead

`TypedDict` objects should be accepted by `DAG`, which should accept `Optional[Mapping[str, Any]]`. 

Unless I'm mistaken, `params` are converted to a `ParamsDict` class and therefore the appropriate type hint is a generic `Mapping` type.

### How to reproduce

Steps to reproduce

```Python
from typing import TypedDict

from airflow import DAG
from airflow.models import Param

class ParamsTypedDict(TypedDict):
    str_param: Param

params: ParamsTypedDict = {
    "str_param": Param("", type="str")
}

with DAG(
    dag_id="mypy-error-dag",
    # The line below raises a mypy error
    # Argument "params" to "DAG" has incompatible type "ParamsTypedDict"; expected "Optional[Dict[Any, Any]]"  [arg-type]
    params=params,  
) as dag:
    pass
```

### Operating System

Amazon Linux

### Versions of Apache Airflow Providers

_No response_

### Deployment

Docker-Compose

### Deployment details

_No response_

### Anything else

_No response_

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Abstract base class that defines how we get an operator link."""
    operators: ClassVar[BaseOperatorClassList] = []
    """
    This property will be used by Airflow Plugins to find the Operators to which you want
    to assign this Operator Link
    :return: List of Operator classes used by task for which you want to create extra link
    """
    @property
    @abstractmethod
    def name(self) -> str:
        """Name of the link. This will be the button name on the task UI."""
    @abstractmethod
    def get_link(self, operator: BaseOperator, *, ti_key: TaskInstanceKey) -> str:
        """Link to external system.
        Note: The old signature of this function was ``(self, operator, dttm: datetime)``. That is still
        supported at runtime but is deprecated.
        :param operator: The Airflow operator object this link is associated to.
        :param ti_key: TaskInstance ID to return link for.
        :return: link to external system
        """