chore(deps): update cloudoperators/juno digest to 9999ff0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cloudoperators/juno (changelog)	action	digest	004c31a → 9999ff0

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[Copilot]

Pull request overview

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Copilot could not run the full agentic suite for this review because it was automatically requested on a bot-authored pull request. Request a review from Copilot under Reviewers to retry with the full agentic suite. Improved support for bot-authored pull requests is coming soon.

Updates the pinned revision of the shared Slack notification reusable workflow used across multiple GitHub Actions workflows.

Changes:

• Bump cloudoperators/juno/.github/workflows/shared-slack-notification.yaml reference from 004c31a... to 9999ff0... in multiple workflows.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/release.yaml	Updates reusable Slack notification workflow SHA for release success/failure notifications
.github/workflows/build-push-supernova-image.yaml	Updates reusable Slack notification workflow SHA for failure notification job
.github/workflows/build-push-greenhouse-pr-preview.yaml	Updates reusable Slack notification workflow SHA for cleanup failure notifications
.github/workflows/build-push-greenhouse-image.yaml	Updates reusable Slack notification workflow SHA for failure notification job