Bump slackclient from 2.8.2 to 2.9.0

[dependabot]

Bumps slackclient from 2.8.2 to 2.9.0.

Release notes

Sourced from slackclient's releases.

version 2.9.0

Refer to v2.9.0 milestone to know the complete list of the issues resolved by this release.

Updates

1. [WebClient] #811 Add workflows.* API support - Thanks @misscoded
2. [WebClient] #810 #809 Only set default filename in files_upload if file is an instance of str - Thanks @csaska

Changelog

Sourced from slackclient's changelog.

<title>Changelog &mdash; Slack Developer Kit for Python</title>
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Commits

• c723633 version 2.9.0
• a7c6658 Add a working sample for #802
• 804b76e python setup.py validate
• 9fd4752 add workflows_* tests
• c0dd86c default workflows_* arguments to None
• 9784c0a add workflow_step type to recognized views
• 8f74a4b add support for workflows.* methods
• cefcf60 Apply black formatter modifications
• 4dd2a32 Add unit tests / integration tests for #810
• 7721499 Only set default filename if instance is a string
• See full diff in compare view

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