Bump slackapi/slack-github-action from v3.0.1 to v3.0.2 in /.github/workflows

[UltralyticsAssistant]

Bump slackapi/slack-github-action from v3.0.1 to v3.0.2 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

🔧 This PR makes a small maintenance update by bumping the Slack GitHub Action in CI from v3.0.1 to v3.0.2 for failure notifications.

📊 Key Changes

• Updated the GitHub Actions workflow in .github/workflows/ci.yml
• Changed the Slack notification step to use slackapi/slack-github-action@v3.0.2 instead of @v3.0.1
• The update applies specifically to the CI job that sends Slack alerts when scheduled or push-based runs fail or are canceled

🎯 Purpose & Impact

• ✅ Keeps CI dependencies current with the latest patch release
• 🛠️ May include minor fixes, reliability improvements, or security updates from the Slack action maintainers
• 📣 Helps ensure failure notifications to Slack remain stable, so the team can respond quickly to CI issues
• 🚀 Low-risk change with no expected impact on product features or end-user functionality