chore(deps): update grafana/shared-workflows/ action to (#394)

Co-authored-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

.github/workflows/docker.yml

@@ -31,7 +31,7 @@ jobs:
           fi
 
       - name: Build and Push to Docker Hub
-        uses: grafana/shared-workflows/actions/build-push-to-dockerhub@2dd0b0349e130ca5ccf86b3a61250589a840bdb2
+        uses: grafana/shared-workflows/actions/build-push-to-dockerhub@81f54fe0cf066c512caafa199a26cb7b3636fd37
         with:
           context: .
           file: ./Dockerfile