Update Grafana to 12.4.2 to address CVE-2026-27876

Bumps grafana/grafana from v12.3.3 to 12.4.2 to remediate the Grafana
Remote Arbitrary Code Execution vulnerability (CVE-2026-27876).

Author: Chris

docker-compose.yaml

@@ -42,8 +42,8 @@ services:
       - 7lc_network
 
   grafana:
-    # grafana/grafana:v12.3.3
-    image: grafana/grafana@sha256:9e1e77ade304069aee3196e9a4f210830e96e80ce9a2640891eccc324b152faf
+    # grafana/grafana:12.4.2
+    image: grafana/grafana@sha256:83749231c3835e390a3144e5e940203e42b9589761f20ef3169c716e734ad505
     container_name: grafana
     restart: unless-stopped
     ports: