Update ipaddress requirement from = 0.8.0 to = 0.8.3
Update ipaddress requirement from = 0.8.0 to = 0.8.3

Updates the requirements on [ipaddress](https://github.com/bluemonk/ipaddress) to permit the latest version.
- [Release notes](https://github.com/bluemonk/ipaddress/releases)
- [Changelog](https://github.com/ipaddress-gem/ipaddress/blob/master/CHANGELOG.rdoc)
- [Commits](https://github.com/bluemonk/ipaddress/commits/v0.8.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sensu-plugins/sensu-plugins-graphite