go.mod: fix removed github.com/mholt/caddy dependency
go.mod: fix removed github.com/mholt/caddy dependency

skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive