Pin prom/prometheus Docker tag to 76947e7 (#6539)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Martin Costello <[email protected]>

Author: renovate[bot]

examples/AspNetCore/docker-compose.yaml

@@ -25,7 +25,7 @@ services:
 
 # Exports Metrics to Prometheus
   prometheus:
-    image: prom/prometheus:latest
+    image: prom/prometheus:v3.6.0@sha256:76947e7ef22f8a698fc638f706685909be425dbe09bd7a2cd7aca849f79b5f64
     command:
       - --config.file=/etc/prometheus.yaml
       - --web.enable-remote-write-receiver