🎨 #4067 恢复默认 HTTP 客户端兼容性，避免非 Starter 手动集成时因默认引入 HttpClient5 导致的问题

weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImplTest.java

@@ -59,6 +59,11 @@ public class BaseWxPayServiceImplTest {
   @Inject
   private WxPayService payService;
 
+  @Test
+  public void testDefaultImplUsesApacheHttpClient() {
+    assertThat(new WxPayServiceImpl()).isInstanceOf(WxPayServiceApacheHttpImpl.class);
+  }
+
   /**
    * Test method for {@link WxPayService#unifiedOrder(WxPayUnifiedOrderRequest)}.
    *