chore(deps): update grafana/tempo docker tag to v2.9.1

Author: renovate[bot]

examples/example-exemplars-tail-sampling/docker-compose.yaml

@@ -52,7 +52,7 @@ services:
       - --enable-feature=native-histograms
       - --config.file=/prometheus.yaml
   tempo:
-    image: grafana/tempo:2.9.0@sha256:65a5789759435f1ef696f1953258b9bbdb18eb571d5ce711ff812d2e128288a4
+    image: grafana/tempo:2.9.1@sha256:290414580eabd1bde91f22e4a4579242fe77377c425223f45d59b8ad1540ce3c
     network_mode: host
     volumes:
       - ./config/tempo-config.yaml:/config.yaml