chore(deps): update grafana/otel-lgtm docker tag to v0.12.0 (open-telemetry#949)

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:0.11.18@sha256:7fcbe915656378fea9fbd6b798b1b925340e85ba5219aaa9b41f8171bee8c9b3
+          image: grafana/otel-lgtm:0.12.0@sha256:205bfb9b4907c9acac5b99a407ad5fc4bf528a73dc735fa39ffc2c3a9335cbe9
           ports:
             - containerPort: 3000
             - containerPort: 4317