chore(deps): update otel/opentelemetry-collector-contrib docker digest to 4a951ff (#1322)

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

Author: renovate[bot]

demo-app/compose.yaml

@@ -1,6 +1,6 @@
 services:
   collector:
-    image: "otel/opentelemetry-collector-contrib@sha256:886722fe0f37af9d1fe24d29529253ec59fbf263b3b1df4facaf221373e19d23"
+    image: "otel/opentelemetry-collector-contrib@sha256:4a951ff0a9772f4fa8e9c7a326434370301b98b2b813933468dcb54aa6a6b5e5"
     volumes:
       - ./collector.yaml:/etc/demo-collector.yaml
     entrypoint: ["/otelcol-contrib"]