release the ByteBuf Fixes #13492 (#13514)

dubbo-rpc/dubbo-rpc-rest/src/main/java/org/apache/dubbo/rpc/protocol/rest/extension/resteasy/filter/ResteasyRequestContainerFilterAdapter.java

@@ -76,6 +76,8 @@ public class ResteasyRequestContainerFilterAdapter implements RestRequestFilter,
             restFilterContext.setComplete(true);
         } catch (Throwable e) {
             throw new RuntimeException("dubbo rest resteasy ContainerRequestFilter write response encode error", e);
+        } finally {
+            containerRequestContext.getHttpRequest().releaseContentBuffer();
         }
     }
 }