build(deps): bump victoriametrics/vmagent

Bumps victoriametrics/vmagent from v1.131.0 to v1.148.0.

---
updated-dependencies:
- dependency-name: victoriametrics/vmagent
  dependency-version: v1.148.0
  dependency-type: direct:production
...

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

docker/infrastructure/observability/docker-compose.yml

@@ -37,7 +37,7 @@ services:
       - "traefik.enable=false"
 
   vmagent:
-    image: victoriametrics/vmagent:v1.131.0
+    image: victoriametrics/vmagent:v1.148.0
     container_name: obs-vmagent
     # vmagent listens on 8429 (its own metrics), scrapes node-exporter:9100
     # and cadvisor:8080, remote_writes to vm-internal.lan