Bump sshtunnel from 0.3.1 to 0.4.0 (#617)
Bump sshtunnel from 0.3.1 to 0.4.0 (#617)

Bumps [sshtunnel](https://github.com/pahaz/sshtunnel) from 0.3.1 to 0.4.0.
- [Release notes](https://github.com/pahaz/sshtunnel/releases)
- [Changelog](https://github.com/pahaz/sshtunnel/blob/master/changelog.rst)
- [Commits](https://github.com/pahaz/sshtunnel/compare/0.3.1...0.4.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
GoogleCloudPlatform/oozie-to-airflow,GoogleCloudPlatform/oozie-to-airflow