### Description

The current length limit for the `login` parameter in an HTTP connection is 500 characters. It'd be nice if this was 5000 characters like the `password` parameter.

### Use case/motivation

We've run into an issue with an API we need to integrate with. It uses basic HTTP authentication, and both username and password are about 900 characters long each. We don't have any control over this API, so we cannot change the authentication method, nor the length of these usernames and passwords.

### 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)

*,
    to_revision: str | None = None,
    from_revision: str | None = None,
    show_sql_only: bool = False,
    reserialize_dags: bool = True,
    session: Session = NEW_SESSION,
):
    """
    Upgrades the DB.
    :param to_revision: Optional Alembic revision ID to upgrade *to*.
        If omitted, upgrades to latest revision.
    :param from_revision: Optional Alembic revision ID to upgrade *from*.
        Not compatible with ``sql_only=False``.
    :param show_sql_only: if True, migration statements will be printed but not executed.
    :param session: sqlalchemy session with connection to Airflow metadata database
    :return: None
    """
    if from_revision and not show_sql_only:
        raise AirflowException("`from_revision` only supported with `sql_only=True`.")
    
    if not settings.SQL_ALCHEMY_CONN:
        raise RuntimeError("The settings.SQL_ALCHEMY_CONN not set. This is a critical assertion.")
    from alembic import command
    import_all_models()
    config = _get_alembic_config()
    if show_sql_only:
        if not from_revision:
            from_revision = _get_current_revision(session)
        if not to_revision:
            script = _get_script_object()