fix: Don't set the Connection header to 'close' if it is already set#26

HofmeisterAn merged 1 commit intotestcontainers:maintestcontainers/Docker.DotNet:mainfrom

ahaeber:fix-upgrade-connection-to-hijack-streamahaeber/Docker.DotNet:fix-upgrade-connection-to-hijack-streamCopy head branch name to clipboard