Update crack requirement from = 0.4.2 to = 0.4.3
Update crack requirement from = 0.4.2 to = 0.4.3

Updates the requirements on [crack](https://github.com/jnunemaker/crack) to permit the latest version.
- [Release notes](https://github.com/jnunemaker/crack/releases)
- [Changelog](https://github.com/jnunemaker/crack/blob/master/History)
- [Commits](https://github.com/jnunemaker/crack/commits/v0.4.3)

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