chore: update github.com/go-redis/redis to v8.11.5

Author: unknwon

go.mod

@@ -11,14 +11,15 @@ require (
 	github.com/cupcake/rdb v0.0.0-20161107195141-43ba34106c76 // indirect
 	github.com/edsrzf/mmap-go v1.0.0 // indirect
 	github.com/go-macaron/inject v0.0.0-20200308113650-138e5925c53b // indirect
-	github.com/go-redis/redis/v8 v8.4.0
+	github.com/go-redis/redis/v8 v8.11.5
 	github.com/go-sql-driver/mysql v1.4.1
 	github.com/lib/pq v1.2.0
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/siddontang/go v0.0.0-20180604090527-bdc77568d726 // indirect
 	github.com/siddontang/ledisdb v0.0.0-20190202134119-8ceb77e66a92
 	github.com/siddontang/rdb v0.0.0-20150307021120-fc89ed2e418d // indirect
 	github.com/smartystreets/goconvey v0.0.0-20190731233626-505e41936337
+	github.com/stretchr/testify v1.6.1 // indirect
 	github.com/unknwon/com v1.0.1
 	golang.org/x/crypto v0.0.0-20201124201722-c8d3bf9c5392 // indirect
 	google.golang.org/appengine v1.6.7 // indirect