chore(deps): update postgres-15 image for Openshift

[aThorp96]

Changes

Update the postgres-15 images used by Openshift for Tekton Results and Tekton Hub.
Made by running ./hack/openshift/update-image-sha.sh and staging only the updates to the postgres images

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Release Notes

Update images digests for Openshift images

[mathur07]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mathur07, pramodbindal

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[divyansh42]

/lgtm

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[pramodbindal]

/lgtm