Update grafana/tempo:latest Docker digest to 6928536 (#30)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| grafana/tempo | digest | `89fd395` -> `6928536` |

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### Configuration

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Reviewed-on: #30
Co-authored-by: Renovate Bot <renovate-bot@valverde.cloud>
Co-committed-by: Renovate Bot <renovate-bot@valverde.cloud>

compose.yml

@@ -48,7 +48,7 @@ services:
 
   tempo:
     <<: *service-base
-    image: grafana/tempo:latest@sha256:89fd395d641588d8714b23d67e93d7502362bf213d3d6d9ecd00f63c1be9a8ea
+    image: grafana/tempo:latest@sha256:692853614cc344c15f5695d3a950fcca326dd7bcffa544fe36b8d978e90a146b
     command: [-config.file=/etc/tempo.yaml]
     volumes:
       - ./telemetry/tempo.yaml:/etc/tempo.yaml