Pin dnspython to latest version 2.5.0

[pyup-bot]

This PR pins dnspython to the latest release 2.5.0.

Changelog

2.5.0

See the [What's New](https://dnspython.readthedocs.io/en/stable/whatsnew.html) page for a summary of this release.

Thanks to all the contributors, and, as usual, thanks to my co-maintainers: Tomáš Křížek, Petr Špaček, and Brian Wellington.

2.4.2

This is a bug fix release, see the [What's New](https://dnspython.readthedocs.io/en/stable/whatsnew.html) page in the documentation for a summary.

Thanks to the people who reported the bugs and, as usual, thanks to my co-maintainers: Tomáš Křížek, Petr Špaček, and Brian Wellington.

Links

• PyPI: https://pypi.org/project/dnspython
• Changelog: https://data.safetycli.com/changelogs/dnspython/