chore(helm): update image docker.io/tombursch/kitchenowl digest to b4a91fb (#37162)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/tombursch/kitchenowl | digest | `10aad71` -> `b4a91fb` |

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

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

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- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

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charts/stable/kitchenowl/values.yaml

@@ -5,7 +5,7 @@ image:
 backendImage:
   repository: docker.io/tombursch/kitchenowl
   pullPolicy: IfNotPresent
-  tag: latest@sha256:10aad716a5dbf2f4c5f548e5c115ad7768b0cd2c18c045766e1c27cc01c695f1
+  tag: latest@sha256:b4a91fb85dc5c6b7b9f6e783daafd1db7b8320058045dc734f7045c4c0c847fb
 
 service:
   main: