### Apache Airflow version

2.7.2

### What happened

Sent request without dry_run parameter to dags/{dag_id}/updateTaskInstancesState and got a 500 error.

### What you think should happen instead

I should be able to send a request to update task instances state and get a valid response.

### How to reproduce

You can see this by commenting out line 215 in tests/api_connexion/schemas/test_task_instance_schema.py and running tests. This is a similar error to #34563.

### Operating System

Ubuntu 20.04

### 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)

"""Schema for handling the request of clearing task instance of a Dag."""
    dry_run = fields.Boolean(load_default=True)
    start_date = fields.DateTime(load_default=None, validate=validate_istimezone)
    end_date = fields.DateTime(load_default=None, validate=validate_istimezone)
    only_failed = fields.Boolean(load_default=True)
    only_running = fields.Boolean(load_default=False)
    include_subdags = fields.Boolean(load_default=False)
    include_parentdag = fields.Boolean(load_default=False)
    reset_dag_runs = fields.Boolean(load_default=False)
    task_ids = fields.List(fields.String(), validate=validate.Length(min=1))
    dag_run_id = fields.Str(load_default=None)
    include_upstream = fields.Boolean(load_default=False)
    include_downstream = fields.Boolean(load_default=False)
    include_future = fields.Boolean(load_default=False)
    include_past = fields.Boolean(load_default=False)
    @validates_schema
    def validate_form(self, data, **kwargs):
        """Validate clear task instance form."""
        if data["only_failed"] and data["only_running"]:
            raise ValidationError("only_failed and only_running both are set to True")
        if data["start_date"] and data["end_date"]:
            if data["start_date"] > data["end_date"]:
                raise ValidationError("end_date is sooner than start_date")
        if data["start_date"] and data["end_date"] and data["dag_run_id"]:
            raise ValidationError("Exactly one of dag_run_id or (start_date and end_date) must be provided")
        if data["start_date"] and data["dag_run_id"]:
            raise ValidationError("Exactly one of dag_run_id or start_date must be provided")
        if data["end_date"] and data["dag_run_id"]:
            raise ValidationError("Exactly one of dag_run_id or end_date must be provided")
class SetTaskInstanceStateFormSchema(Schema):