Downgrade prometheus to v2.31.1 (current official release)

Author: Mesaguy

vars/software/prometheus.yml

@@ -17,7 +17,7 @@ os_options:
         - yarn
 software:
   name: prometheus/prometheus
-  release: v2.31.2
+  release: v2.31.1
   prerelease: v2.32.0-rc.1
   url: https://github.com/prometheus/prometheus
   source: https://github.com/prometheus/prometheus.git