docs: update readme slack

Signed-off-by: Xinwei Xiong <3293172751@qq.com>

README.md

@@ -11,7 +11,7 @@
 <a href="https://goreportcard.com/report/github.com/openimsdk/openkf/server"><img src="https://goreportcard.com/badge/github.com/openimsdk/openkf/server" alt="A+"></a>
 <a href="https://github.com/openimsdk/openkf/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22good+first+issue%22"><img src="https://img.shields.io/github/issues/OpenIMSDK/OpenKF/good%20first%20issue?logo=%22github%22" alt="good first"></a>
 <a href="https://github.com/openimsdk/openkf"><img src="https://img.shields.io/github/stars/OpenIMSDK/OpenKF.svg?style=flat&logo=github&colorB=deeppink&label=stars"></a>
-<a href="https://join.slack.com/t/openimsdk/shared_invite/zt-1tmoj26uf-_FDy3dowVHBiGvLk9e5Xkg"><img src="https://img.shields.io/badge/Slack-500%2B-blueviolet?logo=slack&amp;logoColor=white"></a>
+<a href="https://join.slack.com/t/openimsdk/shared_invite/zt-22720d66b-o_FvKxMTGXtcnnnHiMqe9Q"><img src="https://img.shields.io/badge/Slack-500%2B-blueviolet?logo=slack&amp;logoColor=white"></a>
 <a href="https://github.com/openimsdk/openkf/blob/main/LICENSE"><img src="https://img.shields.io/badge/license-Apache--2.0-green"></a>
 <a href="https://golang.org/"><img src="https://img.shields.io/badge/Language-Go-blue.svg"></a>
 </p>