Send a Slack message v4.3.0

[system]

What’s Changed

• Add Block Kit support.

New Contributors

• @bitrise-silver made their first contribution in Add Block Kit support by bitrise-silver · Pull Request #93 · bitrise-steplib/steps-slack-message · GitHub

Full Changelog: Comparing 4.2.2...4.3.0 · bitrise-steplib/steps-slack-message · GitHub

Release 4.3.0 · bitrise-steplib/steps-slack-message