Add the Docker secrets engine client, used to read the Docker Desktop session for Docker Hub. It brings in github.com/docker/secrets-engine/x v0.8.5 and connectrpc.com/connect v1.19.1.
The client module requires go1.26.10, which raises the go directive in vendor.mod from 1.26.0.
Signed-off-by: Alano Terblanche <18033717+Benehiko@users.noreply.github.com>
