docs(README.md): update doc addr, to v9

Signed-off-by: monkey92t <golang@88.com>

Author: monkey92t

README.md

@@ -18,8 +18,8 @@
 - [Documentation](https://redis.uptrace.dev)
 - [Discussions](https://github.com/go-redis/redis/discussions)
 - [Chat](https://discord.gg/rWtp5Aj)
-- [Reference](https://pkg.go.dev/github.com/go-redis/redis/v8?tab=doc)
-- [Examples](https://pkg.go.dev/github.com/go-redis/redis/v8?tab=doc#pkg-examples)
+- [Reference](https://pkg.go.dev/github.com/go-redis/redis/v9)
+- [Examples](https://pkg.go.dev/github.com/go-redis/redis/v9#pkg-examples)
 
 ## Ecosystem