Update grafana/tempo:latest Docker digest to 9d90999 (#38)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| grafana/tempo | digest | `4b9b945` -> `9d90999` |

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### Configuration

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Reviewed-on: #38
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@sha256:4b9b94524558dea1209a1d4bca56b758114d1b2269b7184329632ba3879b5a5e
+    image: grafana/tempo:latest@sha256:9d90999be135693b4883b751b56844971a2718edaf93b3fa53430684d6a99d93
     command: [-config.file=/etc/tempo.yaml]
     volumes:
       - ./telemetry/tempo.yaml:/etc/tempo.yaml