chore: sync template versions with image updates

library/compose/prometheus/template.yaml

@@ -13,9 +13,9 @@ metadata:
     Documentation: https://prometheus.io/docs/
 
     GitHub: https://github.com/prometheus/prometheus
-  version: v3.5.0
+  version: v3.7.3
   author: Christian Lempa
-  date: '2025-09-28'
+  date: '2025-10-31'
   tags:
     - monitoring
     - alerting