vendor: fix docker/docker vendoring (update to 9f28837c1d93

commit c41b006be1 updated the version of
docker/docker in go.mod, but possibly overlooked that there was still a
replace rule present. As a result the version was not actually updated.

This patch removes the replace rule, updating docker/docker to 9f28837c1d93

full diff: 4634ce647c...9f28837c1d

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/moby/sys/mount/unmount_unsupported.go

@@ -0,0 +1,7 @@
+// +build windows
+
+package mount
+
+func unmount(target string, flag int) error {
+	panic("Not implemented")
+}