deps: upgrade kratos version to v2.8.1 (#3436) #6348

Job	Run time
resolve module	6s
lint module (.)	25s
lint module (./cmd/protoc-gen-go-http)	25s
lint module (./cmd/protoc-gen-go-errors)	22s
lint module (./cmd/kratos)	16s
lint module (./contrib/encoding/msgpack)	15s
lint module (./contrib/registry/zookeeper)	16s
lint module (./contrib/registry/polaris)	28s
lint module (./contrib/registry/nacos)	19s
lint module (./contrib/registry/etcd)	28s
lint module (./contrib/registry/discovery)	18s
lint module (./contrib/registry/consul)	18s
lint module (./contrib/registry/eureka)	18s
lint module (./contrib/registry/servicecomb)	26s
lint module (./contrib/registry/kubernetes)	53s
lint module (./contrib/errortracker/sentry)	24s
lint module (./contrib/polaris)	32s
lint module (./contrib/config/polaris)	26s
lint module (./contrib/config/nacos)	26s
lint module (./contrib/config/etcd)	30s
lint module (./contrib/config/apollo)	21s
lint module (./contrib/config/consul)	23s
lint module (./contrib/config/kubernetes)	49s
lint module (./contrib/log/zap)	14s
lint module (./contrib/log/fluent)	18s
lint module (./contrib/log/zerolog)	21s
lint module (./contrib/log/aliyun)	24s
lint module (./contrib/log/tencent)	18s
lint module (./contrib/log/logrus)	19s
lint module (./contrib/opensergo)	26s
	11m 44s

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