chore(helm): update image ghcr.io/open-webui/open-webui digest to 6ab343d (#28364)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| ghcr.io/open-webui/open-webui | digest | `95e477d` -> `6ab343d` |

Add the preset `:preserveSemverRanges` to your config if you don't want
to pin your dependencies.

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### Configuration

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Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

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rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
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charts/stable/ollama/Chart.yaml

@@ -35,4 +35,4 @@ sources:
   - https://github.com/truecharts/charts/tree/master/charts/stable/ollama
   - https://hub.docker.com/r/ollama/ollama
 type: application
-version: 7.4.7
+version: 7.4.8

charts/stable/ollama/values.yaml

@@ -9,7 +9,7 @@ rocmImage:
 uiImage:
   repository: ghcr.io/open-webui/open-webui
   pullPolicy: IfNotPresent
-  tag: latest@sha256:95e477dac2b0a4109c7944491ad0e81b4febb5701f72ee9b087a4e431f903733
+  tag: latest@sha256:6ab343db4e8dce91e303d51c4882efada46d89dcfd3554f4993b7fafd05d2899
 
 securityContext:
   container: