build(deps): bump prom/node-exporter

Bumps prom/node-exporter from v1.9.1 to v1.12.1.

---
updated-dependencies:
- dependency-name: prom/node-exporter
  dependency-version: v1.12.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

docker/infrastructure/observability/docker-compose.yml

@@ -9,7 +9,7 @@
 
 services:
   node-exporter:
-    image: prom/node-exporter:v1.9.1
+    image: prom/node-exporter:v1.12.1
     container_name: obs-node-exporter
     network_mode: host
     pid: host