Update grafana/grafana Docker tag to v10.2.3 (#101)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

manifests/monitoring/grafana.yaml

@@ -138,7 +138,7 @@ spec:
           - 0
       containers:
         - name: grafana
-          image: grafana/grafana:10.2.2
+          image: grafana/grafana:10.2.3
           imagePullPolicy: IfNotPresent
           env:
             - name: GF_SECURITY_ADMIN_USER