credits: remove outdated contributor link and repos (#13776) (#13785)

* credits: remove an outdated contributor link

* credits: remove outdated repos

---------

Co-authored-by: Lilian Lee <lilin@pingcap.com>

credits.md

@@ -13,32 +13,24 @@ TiDB 开发者为 TiDB 的新功能开发、性能优化、稳定性保障做出
 
 - [pingcap/tidb](https://github.com/pingcap/tidb/graphs/contributors)
 - [tikv/tikv](https://github.com/tikv/tikv/graphs/contributors)
-- [pingcap/parser](https://github.com/pingcap/parser/graphs/contributors)
 - [tikv/pd](https://github.com/tikv/pd/graphs/contributors)
 - [pingcap/tiflash](https://github.com/pingcap/tiflash/graphs/contributors)
 - [pingcap/tidb-operator](https://github.com/pingcap/tidb-operator/graphs/contributors)
 - [pingcap/tiup](https://github.com/pingcap/tiup/graphs/contributors)
-- [pingcap/br](https://github.com/pingcap/br/graphs/contributors)
-- [pingcap/dm](https://github.com/pingcap/dm/graphs/contributors)
 - [pingcap/tidb-binlog](https://github.com/pingcap/tidb-binlog/graphs/contributors)
 - [pingcap/tidb-dashboard](https://github.com/pingcap/tidb-dashboard/graphs/contributors)
 - [pingcap/tiflow](https://github.com/pingcap/tiflow/graphs/contributors)
 - [pingcap/tidb-tools](https://github.com/pingcap/tidb-tools/graphs/contributors)
-- [pingcap/tidb-lightning](https://github.com/pingcap/tidb-lightning/graphs/contributors)
 - [pingcap/tispark](https://github.com/pingcap/tispark/graphs/contributors)
-- [pingcap/dumpling](https://github.com/pingcap/dumpling/graphs/contributors)
 - [tikv/client-java](https://github.com/tikv/client-java/graphs/contributors)
 - [tidb-incubator/TiBigData](https://github.com/tidb-incubator/TiBigData/graphs/contributors)
 - [ti-community-infra](https://github.com/orgs/ti-community-infra/people)
 
-完整的贡献者名单，请查阅 [SIG | TiDB DevGroup](https://contributor.tidb.io/sig)
-
 ## TiDB 文档写作者和译员
 
 TiDB 文档写作者和译员为 TiDB 及相关项目撰写文档、提供翻译。以下链接包含了 TiDB 文档相关 repo 的贡献者名单：
 
 - [pingcap/docs-cn](https://github.com/pingcap/docs-cn/graphs/contributors)
 - [pingcap/docs](https://github.com/pingcap/docs/graphs/contributors)
 - [pingcap/docs-tidb-operator](https://github.com/pingcap/docs-tidb-operator/graphs/contributors)
-- [pingcap/docs-dm](https://github.com/pingcap/docs-dm/graphs/contributors)
 - [tikv/website](https://github.com/tikv/website/graphs/contributors)