chore(deps): update grafana/otel-lgtm docker tag to v0.18.1 (#1020)

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

Author: renovate[bot]

logging-k8s-stdout-otlp-json/k8s/lgtm.yaml

@@ -47,7 +47,7 @@ spec:
     spec:
       containers:
         - name: lgtm
-          image: grafana/otel-lgtm:0.17.1@sha256:557ddac3121c7b470b59dfb4f69a4d24d9f6a3c9d63b330152498a3650f720bf
+          image: grafana/otel-lgtm:0.18.1@sha256:bf7bfb9c216f240bd930b278049568e8f8500adcee808c076a556bc767544408
           ports:
             - containerPort: 3000
             - containerPort: 4317