Remove no longer working testHttp2Push

Author: kelunik

test/ClientHttpBinIntegrationTest.php

@@ -237,17 +237,6 @@ public function testHeaderCase(): \Generator
         ], $result);
     }
 
-    public function testHttp2Push(): \Generator
-    {
-        $request = new Request('https://http2-server-push-demo.keksi.io/');
-        $request->setPushHandler(static function (Request $request, Promise $response) {
-            self::assertSame('/image.jpg', $request->getUri()->getPath());
-            self::assertSame('image/jpeg', (yield $response)->getHeader('content-type'));
-        });
-
-        yield $this->executeRequest($request);
-    }
-
     public function testGzipBomb(): \Generator
     {
         $this->markTestSkipped('Run this manually');