chore(deps): update cloudoperators/juno digest to 96c1282

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cloudoperators/juno (changelog)	workflow	digest	28cdec0 → 96c1282

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[Copilot]

Pull request overview

This PR updates the pinned commit digest used to reference the reusable shared-slack-notification.yaml workflow from cloudoperators/juno, keeping Slack notification jobs in this repo aligned with the latest upstream workflow revision.

Changes:

• Bump cloudoperators/juno/.github/workflows/shared-slack-notification.yaml reference from 28cdec0… to 96c1282… in the release workflow.
• Apply the same digest bump to Slack notification jobs in the Supernova and Greenhouse image workflows (including PR preview cleanup 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 the reusable Slack notification workflow digest for success/failure notifications during releases.
.github/workflows/build-push-supernova-image.yaml	Updates the reusable Slack notification workflow digest for Supernova image failure notifications.
.github/workflows/build-push-greenhouse-pr-preview.yaml	Updates the reusable Slack notification workflow digest for PR preview cleanup failure notifications.
.github/workflows/build-push-greenhouse-image.yaml	Updates the reusable Slack notification workflow digest for Greenhouse image failure notifications.

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