Fix issue with Docker API version negotiation in Traefik#4
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Fixes an issue with Traefik and Docker v29+ where docker-proxy-filter doesn't correctly handle HEAD requests to
/_pingused for API version negotiation.Traefik >=2.11.31 / >=3.6.1 auto-negotiates the Docker API version by sending a HEAD request to
/_ping. docker-proxy-filter currently doesn’t respond correctly, causing a hang since Docker doesn’t return a body for HEAD requests.See traefik/traefik#12256