Strom: v4.27.0

vcptr 854f97fb78 remove script's fiddling		6 rokov pred
..
github.com	fa0a21f0dd external module refraction-networking/utls use mod version	6 rokov pred
README.md	c022ce610e add doc under external	6 rokov pred
update-deps.sh	854f97fb78 remove script's fiddling	6 rokov pred

Note

The external dir in the project exists for historical reasons. We will migrate to use go mod to maintain 3rd party libraries.

Fow now, all modules under external are used by "quic-go" to support quic protocol, and can't migrate without a breaking change.

The plan is that we will remove the whole external dir when quic-go is tested to be matured enough in production.