### 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 setting state of task instance of a DAG."""
    dry_run = fields.Boolean(dump_default=True)
    task_id = fields.Str(required=True)
    execution_date = fields.DateTime(validate=validate_istimezone)
    dag_run_id = fields.Str()
    include_upstream = fields.Boolean(required=True)
    include_downstream = fields.Boolean(required=True)
    include_future = fields.Boolean(required=True)
    include_past = fields.Boolean(required=True)
    new_state = TaskInstanceStateField(
        required=True,
        validate=validate.OneOf(
            [TaskInstanceState.SUCCESS, TaskInstanceState.FAILED, TaskInstanceState.SKIPPED]
        ),
    )
    @validates_schema
    def validate_form(self, data, **kwargs):
        """Validate set task instance state form."""
        if not exactly_one(data.get("execution_date"), data.get("dag_run_id")):
            raise ValidationError("Exactly one of execution_date or dag_run_id must be provided")
class SetSingleTaskInstanceStateFormSchema(Schema):
    """Schema for handling the request of updating state of a single task instance."""
    dry_run = fields.Boolean(load_default=True)
    new_state = TaskInstanceStateField(
        required=True,
        validate=validate.OneOf(
            [TaskInstanceState.SUCCESS, TaskInstanceState.FAILED, TaskInstanceState.SKIPPED]
        ),
    )
class TaskInstanceReferenceSchema(Schema):