chore(docker): update docker digests

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/ubuntu	final	digest	a6d2b38 -> 19478ce
docker.io/ubuntu	final	digest	874aca5 -> 0b89735

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[phil-davis]

I think that this needs a newer https://github.com/owncloud-ci/wait-for/releases

wait-for had updates for its underlying Alpine Linux.
I just did PR owncloud-ci/wait-for#140 to fix the notification in the merge CI.

It looks like renovate-bot with "ownclouders" has some way that it generates a release. Maybe that will happen automagically "real soon now" (tm). Let's see.

Then renovate-bot needs to update this PR (or do another one) to suck in the latest wait-for.

[phil-davis]

https://drone.owncloud.com/owncloud-docker/ubuntu/441/3/5

usr/bin/wait-for (gobinary)
===========================
Total: 4 (HIGH: 4, CRITICAL: 0)

It is still reporting these 4 CVEs and says that they are a problem with wait-for

[phil-davis]

Also bumped wait-for to v2.0.4 - that resolves the CVEs reported by Trivy.