### Description

Currently, the `airflow variables export` command requires an explicit file path and does not support output to stdout. However connections can be printed to stdout using `airflow connections export -`. This inconsistency between the two export commands can lead to confusion and limits the flexibility of the variables export command.

### Use case/motivation

To bring some consistency, similar to connections, variables should also be printed to STDOUT, using `-` instead of filename. 

### Related issues

_No response_

### Are you willing to submit a 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)

return {
        "id": conn.id,
        "conn_id": conn.conn_id,
        "conn_type": conn.conn_type,
        "description": conn.description,
        "host": conn.host,
        "schema": conn.schema,
        "login": conn.login,
        "password": conn.password,
        "port": conn.port,
        "is_encrypted": conn.is_encrypted,
        "is_extra_encrypted": conn.is_encrypted,
        "extra_dejson": conn.extra_dejson,
        "get_uri": conn.get_uri(),
    }
@suppress_logs_and_warning
@providers_configuration_loaded
def connections_get(args):