chore(deps): update dependency @types/node to v16 (#5170)

* Update Node types to 16

* Update Express core types

Fixes a number of conflicts it has with Node 16.

* Fix websocket router types

It seems req was `any` before so now we have to handle the types.  Also
it seems the socket is of type `stream.Duplex`, not `net.Socket`.

The ws types had to be updated to support the new type.

Unfortunately Code still uses the old type so cast for now.

In the web socket router just use a cast for the extra properties we
add.  We could add the types to the Express namespace but I am not sure
we really want these commonly accessible so keep with the casts for now.
Likely we should use Express's `locals` or something instead.

* Add missing return

Not sure why it only just now started complaining though.

Co-authored-by: Asher <ash@coder.com>

src/node/routes/vscode.ts

@@ -127,7 +127,10 @@ export class CodeServerRouteWrapper {
 
   private $proxyWebsocket = async (req: WebsocketRequest) => {
     const wrappedSocket = await this._socketProxyProvider.createProxy(req.ws)
-    this._codeServerMain.handleUpgrade(req, wrappedSocket)
+    // This should actually accept a duplex stream but it seems Code has not
+    // been updated to match the Node 16 types so cast for now.  There does not
+    // appear to be any code specific to sockets so this should be fine.
+    this._codeServerMain.handleUpgrade(req, wrappedSocket as net.Socket)
 
     req.ws.resume()
   }