CODEOWNERS: update codeowner rule for sig exec and planner (#15079)
CODEOWNERS: update codeowner rule for sig exec and planner (#15079)


EvilMcJerkface/tidb,c4pt0r/tidb,coocood/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,coocood/tidb,c4pt0r/tidb,ngaut/tidb,XuHuaiyu/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,XuHuaiyu/tidb,c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb,kyle-wang/tidb