Fixed WASM runtime

Author: seifibrahim32

pkgs/http/test/html/cache_test.dart

@@ -18,7 +18,7 @@ void main() {
   late Uri url;
   setUp(() async {
     final channel = spawnHybridUri(Uri(path: '/test/stub_server.dart'));
-    var port = await channel.stream.first as int;
+    var port = await (channel.stream.first as num).toInt();
     url = echoUrl.replace(port: port);
   });
 

pkgs/http/test/html/client_test.dart

@@ -18,7 +18,7 @@ void main() {
   setUpAll(() async {
     final channel =
         spawnHybridUri(Uri(path: '/test/stub_server.dart'), stayAlive: true);
-    port = await channel.stream.first as int;
+    port = await (channel.stream.first as num).toInt();
   });
 
   test('#send a StreamedRequest', () async {

pkgs/http/test/html/streamed_request_test.dart

@@ -18,7 +18,7 @@ void main() {
   setUpAll(() async {
     final channel =
         spawnHybridUri(Uri(path: '/test/stub_server.dart'), stayAlive: true);
-    var port = await channel.stream.first as int;
+    var port = await (channel.stream.first as num).toInt();
     url = echoUrl.replace(port: port);
   });
   group('contentLength', () {