Bump grafana/grafana-oss from 12.4.1 to 12.4.2 in /docker (#55)

Bumps grafana/grafana-oss from 12.4.1 to 12.4.2.

---
updated-dependencies:
- dependency-name: grafana/grafana-oss
  dependency-version: 12.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

docker/docker-compose.yml

@@ -196,7 +196,7 @@ services:
       start_period: 30s
 
   grafana:
-    image: grafana/grafana-oss:12.4.1
+    image: grafana/grafana-oss:12.4.2
     container_name: grafana
     hostname: grafana
     restart: unless-stopped