db(dumpling): use net.JoinHostPort to generate host-port part of URI (#36113)
db(dumpling): use net.JoinHostPort to generate host-port part of URI (#36113)

close pingcap/tidb#36112
pingcap/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb