update CODEOWNERS (#4673)

Signed-off-by: NXiangyu Wang <xiangyu.wang@zilliz.com>

CODEOWNERS

 # Each line is a component followed by one or more owners. 
 
-*                        @JinHai-CN
 /sdk                     @scsven
 /shards                  @XuPeng-SH
 /core/                   @scsven
 /core/src/db/meta        @yhmo
 /core/src/index/knowhere @cydrain
-/core/src/index/         @shengjun1985
\ No newline at end of file
+/core/src/index/         @shengjun1985