refactor: use `RootCertStore::add_trust_anchors` (#1165)
Fixes `use of deprecated method `tokio_rustls::rustls::RootCertStore::add_server_trust_anchors`: Please use `add_trust_anchors` instead`
Fixes `use of deprecated method `tokio_rustls::rustls::RootCertStore::add_server_trust_anchors`: Please use `add_trust_anchors` instead`