Bump slackapi/slack-github-action from v3.0.5 to v4.0.0 in /.github/workflows

[UltralyticsAssistant]

Bump slackapi/slack-github-action from v3.0.5 to v4.0.0 in /.github/workflows

This PR updates GitHub Actions references in this repository.

Examples:

• Branch: actions/checkout@main stays on @main
• Major tag: actions/checkout@v4 updates to @v5
• Specific tag: astral-sh/setup-uv@v0.5.0 updates to @v0.9.4
• SHA pinned: actions/checkout@<sha> # v4.1.0 updates to the latest release SHA and tag comment

_{Made with ❤️ by Ultralytics Actions}

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

🔄 Updates Slack notifications in the publishing workflow to Slack GitHub Action v4.0.0.

📊 Key Changes

• Upgraded the slackapi/slack-github-action dependency from v3.0.5 to v4.0.0.
• Applied the update to both success and failure notification steps in .github/workflows/publish.yml.
• Preserved the existing incoming-webhook configuration and notification messages.

🎯 Purpose & Impact

• ✅ Keeps release and failure notifications aligned with the latest supported Slack GitHub Action version.
• 🛠️ May provide improved compatibility, maintenance, and security through the newer action release.
• 📣 Slack notifications for publishing workflows should continue working without changes to repository secrets or message content.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!