chore(deps): update cloudoperators/juno digest to 1f68296

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cloudoperators/juno (changelog)	action	digest	ad16f84 → 1f68296

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[Copilot]

Pull request overview

Updates the pinned commit digest for the reusable cloudoperators/juno GitHub Actions workflow used to send Slack notifications, keeping CI/release automation aligned with the latest upstream workflow revision.

Changes:

• Bump cloudoperators/juno/.github/workflows/shared-slack-notification.yaml reference from ad16f84... to 7aea99e... across workflows.
• Apply the update consistently to release success/failure and image build failure notifications.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.github/workflows/release.yaml	Updates reusable Slack notification workflow digest for release success/failure jobs.
.github/workflows/build-push-supernova-image.yaml	Updates reusable Slack notification workflow digest for Supernova image failure notifications.
.github/workflows/build-push-greenhouse-pr-preview.yaml	Updates reusable Slack notification workflow digest for PR preview cleanup failure notifications.
.github/workflows/build-push-greenhouse-image.yaml	Updates reusable Slack notification workflow digest for Greenhouse image failure notifications.

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