fix(quaint): set TLS 1.2 minimum on macOS to prevent P1011 bad protocol version

macOS Security framework defaults to TLS 1.0 which causes "bad protocol
version" errors when connecting to PostgreSQL servers requiring TLS 1.2+
(e.g., Ubicloud Managed Postgres #29600). Add conditional platform guard
so only macOS builds enforce TLS 1.2 minimum; Linux/Windows unchanged.

Author: arab971

quaint/Cargo.toml

@@ -52,6 +52,8 @@ postgresql-native = [
   "dep:lru-cache",
   "dep:byteorder",
   "dep:tokio-tungstenite",
+  "tokio-util/compat",
+  "tokio-util/io-util",
 ]
 postgresql = []
 

quaint/src/connector/postgres/native/mod.rs

@@ -921,6 +921,14 @@ impl MakeTlsConnectorManager {
                     if let Some(identity) = auth.identity.0 {
                         tls_builder.identity(identity);
                     }
+
+                    // Configure TLS minimum version for macOS (Security framework defaults to TLS 1.0)
+                    // This prevents "bad protocol version" errors when connecting to PostgreSQL
+                    // servers that require TLS 1.2+ (e.g., managed cloud databases like Ubicloud)
+                    #[cfg(target_os = "macos")]
+                    {
+                        tls_builder.min_protocol_version(Some(native_tls::Protocol::Tlsv12));
+                    }
                 }
 
                 let tls_connector = MakeTlsConnector::new(tls_builder.build()?);