switch dependency to http-proxy-node16

[minrk]

seems to improve socket leak in #434

[manics]

This seems fine to me. The code diff between the HEAD of http-proxy and http-proxy-node16
is just https://github.com/Jimbly/http-proxy-node16/compare/9b96cd7..HEAD

diff --git a/lib/http-proxy/passes/web-incoming.js b/lib/http-proxy/passes/web-incoming.js
index 7ae7355..64da741 100644
--- a/lib/http-proxy/passes/web-incoming.js
+++ b/lib/http-proxy/passes/web-incoming.js
@@ -18,6 +18,11 @@ var nativeAgents = { http: httpNative, https: httpsNative };
  * flexible.
  */
 
+// 'aborted' event stopped working reliably on v15.5.0 and was later removed entirely
+var supportsAbortedEvent = (function () {
+  var ver = process.versions.node.split('.').map(Number);
+  return ver[0] <= 14 || ver[0] === 15 && ver[1] <= 4;
+}());
 
 module.exports = {
 
@@ -143,9 +148,18 @@ module.exports = {
     }
 
     // Ensure we abort proxy if request is aborted
-    req.on('aborted', function () {
-      proxyReq.abort();
-    });
+    if (supportsAbortedEvent) {
+      req.on('aborted', function () {
+        proxyReq.abort();
+      });
+    } else {
+      res.on('close', function () {
+        var aborted = !res.writableFinished;
+        if (aborted) {
+          proxyReq.abort();
+        }
+      });
+    }
 
     // handle errors in proxy and incoming request, just like for forward proxy
     var proxyError = createErrorHandler(proxyReq, options.target);
diff --git a/lib/http-proxy/passes/ws-incoming.js b/lib/http-proxy/passes/ws-incoming.js
index 270f23f..c38036b 100644
--- a/lib/http-proxy/passes/ws-incoming.js
+++ b/lib/http-proxy/passes/ws-incoming.js
@@ -129,7 +129,7 @@ module.exports = {
       // if it errors (eg, vanishes from the net and starts returning
       // EHOSTUNREACH). We need to do that explicitly.
       socket.on('error', function () {
-        proxySocket.end();
+        proxySocket.destroy();
       });
 
       common.setupSocket(proxySocket);

Relevant node issues are:

• Detecting client request aborts in nodejs >= 15.50 is broken nodejs/node#46666
• Missing 'aborted' on IncomingMessage (v16 regression) nodejs/node#40775