Fix http socket encoding check (#20031)

Co-authored-by: Jarred-Sumner <709451+Jarred-Sumner@users.noreply.github.com>

src/js/node/_http_server.ts

@@ -1408,6 +1408,12 @@ const NodeHTTPServerSocket = class Socket extends Duplex {
     return this;
   }
 
+  setEncoding(_encoding) {
+    const err = new Error("Changing the socket encoding is not allowed per RFC7230 Section 3.");
+    err.code = "ERR_HTTP_SOCKET_ENCODING";
+    throw err;
+  }
+
   unref() {
     return this;
   }