https://github.com/pingcap/TiProxy/blob/main/lib/config/proxy.go#L114
这里写了支持TLS 1.0~1.3 默认 1.2
但是在tidb里,小于1.2会报warn,
https://github.com/pingcap/tidb/blob/master/util/misc.go#L499
"Minimum TLS version allows pre-TLSv1.2 protocols, this is not recommended",
tiproxy是否也需要加上?