Re-enable StreamingSimpleClientHttpRequestFactoryTests

Since the okhttp3 3.14 downgrade, we don't need to ignore this test
anymore.

spring-web/src/test/java/org/springframework/http/client/StreamingSimpleClientHttpRequestFactoryTests.java

@@ -43,7 +43,6 @@ public class StreamingSimpleClientHttpRequestFactoryTests extends AbstractHttpRe
 	}
 
 	@Test  // SPR-8809
-	@Disabled("response.close() hangs indefinitely since upgrading from okhttp3 3.14.2 to 4.1.0")
 	public void interceptor() throws Exception {
 		final String headerName = "MyHeader";
 		final String headerValue = "MyValue";