chore(deps): update rebelcore/jellyfin-exporter docker tag to v1.4.0 (#3662)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| rebelcore/jellyfin-exporter | minor | `v1.3.9` → `v1.4.0` |

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### Configuration

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🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

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Reviewed-on: #3662
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clusters/cl01tl/helm/jellyfin/values.yaml

@@ -28,7 +28,7 @@ jellyfin:
         exporter:
           image:
             repository: rebelcore/jellyfin-exporter
-            tag: v1.3.9
+            tag: v1.4.0
             pullPolicy: IfNotPresent
           args:
             - '--jellyfin.address=http://127.0.0.1:8096'