websocket: update nhooyr.io/websocket to github.com/coder/websocket

Maintenance of nhooyr.io/websocket has moved to github.com/coder/websocket.

Read more about the transition at https://coder.com/blog/websocket

Updates golang/go#18152

Change-Id: Ia2b11c9a57ad7ded775b50a5bbb7ea91562d39b5
GitHub-Last-Rev: 59cea5e
GitHub-Pull-Request: #222
Reviewed-on: https://go-review.googlesource.com/c/net/+/614075
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>

Author: mafredri

websocket/websocket.go

@@ -8,7 +8,7 @@
 // This package currently lacks some features found in an alternative
 // and more actively maintained WebSocket package:
 //
-//	https://pkg.go.dev/nhooyr.io/websocket
+//	https://pkg.go.dev/github.com/coder/websocket
 package websocket // import "golang.org/x/net/websocket"
 
 import (