chore(deps): bump slackclient from 2.8.0 to 2.9.3
chore(deps): bump slackclient from 2.8.0 to 2.9.3

Bumps [slackclient](https://github.com/slackapi/python-slackclient) from 2.8.0 to 2.9.3.
- [Release notes](https://github.com/slackapi/python-slackclient/releases)
- [Changelog](https://github.com/slackapi/python-slackclient/blob/main/docs/changelog.html)
- [Commits](https://github.com/slackapi/python-slackclient/compare/v2.8.0...v2.9.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
DandyDev/slack-machine