[bug] fix the CI dockerhub release error

[hsluoyz]

See: https://github.com/casbin/casbin-server/actions/runs/11123579881/job/30907360372

[ali-shokoohi]

@hsluoyz Hi. Because this project is using Golang version 1.19, We should choose good versions for packages.
Also, we have "google.golang.org/grpc" in the go.mod file, we only need to run go mod download command.
I just created a bugfix PR here:
#118