Update stack / list: ETag not updated

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Describe the bug
Within the Android Deck app, we use the REST-Endpoints to fetch data from the server using ETags. When a User changes the name of a list, the ETags don't seem to get updated, so our Android client only gets notified, when the user also changes a card within the list.

See this: https://github.com/stefan-niedermann/nextcloud-deck/issues/861

To Reproduce
Steps to reproduce the behavior:

1. WebUI: change list name
2. Android: pull to refresh
3. Name of the list won't get updated
4. WebUI: change a card in same list
5. Android pull to refresh
6. changed card and list both get updated

Expected behavior
On list-update, the etags of the list and the board should be updated

Client details:
see here: https://github.com/stefan-niedermann/nextcloud-deck/issues/861

CC: @stefan-niedermann

Reproduce the issue by renaming a list in the WebUI, refreshing the Android client, then changing a card and refreshing again. Trace the REST response ETags for the list and board during these steps; done means both ETags change after a list rename so the Android client receives the new name without a card update.