chore(yacy): update image docker.io/yacy/yacy_search_server digest to 4e9a87d (#49937)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/yacy/yacy_search_server | digest | `20835e4` → `4e9a87d` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the [Dependency
Dashboard](../issues/18710) for more information.

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

---

### Configuration

📅 **Schedule**: (UTC)

- 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.

---

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

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xMzAuMSIsInVwZGF0ZWRJblZlciI6IjQzLjEzMC4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImFwcC95YWN5IiwiYXV0b21lcmdlIiwicmVub3ZhdGUvY29udGFpbmVyIiwidHlwZS9kaWdlc3QiXX0=-->

charts/stable/yacy/Chart.yaml

@@ -37,5 +37,5 @@ sources:
   - https://hub.docker.com/r/yacy/yacy_search_server
   - https://yacy.net/
 type: application
-version: 9.6.0
+version: 9.6.1
 

charts/stable/yacy/values.yaml

@@ -2,7 +2,7 @@
 image:
   pullPolicy: IfNotPresent
   repository: docker.io/yacy/yacy_search_server
-  tag: latest@sha256:20835e41b005253ab16d3ef8f0d3626bbb81a88314f943092648fa3d2606a187
+  tag: latest@sha256:4e9a87dd37cc3e446d0784441f0f6c54f7eee1b87381f4b60634f2010cce43b4
 persistence:
   appdata:
     enabled: true