当引入spring cloud sleuth组件时，使用feign调用其他服务报错NullPointerException

[ming697]

Describe the bug
当引入sleuth组件时，使用feign调用其他服务报错NullPointerException

To Reproduce
org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer#execute调用request.client().execute(request.toRequest(), options)时会走org.springframework.cloud.sleuth.instrument.web.client.feign.TracingFeignClient这个实现，TracingFeignClient在构建Feign.Request时没有设置RequestTemplate，EnhancedFeignClient实际执行时构建DefaultServiceInstance serviceInstance = new DefaultServiceInstance(request.requestTemplate().feignTarget().name(), url.getHost(), url.getPort(), url.getScheme().equals("https"));导致空指针

Environment

• spring cloud tencent version: 1.13.3-Hoxton.SR12
• spring-cloud-starter-openfeign: 2.2.2.RELEASE
• feign-core: 10.9

Additional context