chore(deps): update grafana/otel-lgtm docker tag to v0.15.0 (#985)

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:0.14.0@sha256:72628a43fbd8574b066cd06273545ec9cc74314f360598ee8de27770bd904faa
+          image: grafana/otel-lgtm:0.15.0@sha256:c258debb6cd0e2be844adad8231a1268d9e12fa46aa0f78e15472bbe7837f12b
           ports:
             - containerPort: 3000
             - containerPort: 4317