Fix the sha digest of weekly workbench images

[harshad16]

Fix the sha digest of weekly workbench images

Description

The PR: https://github.com/opendatahub-io/odh-manifests/pull/814/files reference same image digest
for all the workbench images.

This PR update image digest based on weekly update.

How Has This Been Tested?

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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