Update vendoring

vendor/github.com/go-sql-driver/mysql/dsn.go

@@ -53,6 +53,7 @@ type Config struct {
 	InterpolateParams       bool // Interpolate placeholders into query string
 	MultiStatements         bool // Allow multiple statements in one query
 	ParseTime               bool // Parse time values to time.Time
+	RejectReadOnly          bool // Reject read-only connections
 	Strict                  bool // Return warnings as errors
 }
 
@@ -195,6 +196,15 @@ func (cfg *Config) FormatDSN() string {
 		buf.WriteString(cfg.ReadTimeout.String())
 	}
 
+	if cfg.RejectReadOnly {
+		if hasParam {
+			buf.WriteString("&rejectReadOnly=true")
+		} else {
+			hasParam = true
+			buf.WriteString("?rejectReadOnly=true")
+		}
+	}
+
 	if cfg.Strict {
 		if hasParam {
 			buf.WriteString("&strict=true")
@@ -472,6 +482,14 @@ func parseDSNParams(cfg *Config, params string) (err error) {
 				return
 			}
 
+		// Reject read-only connections
+		case "rejectReadOnly":
+			var isBool bool
+			cfg.RejectReadOnly, isBool = readBool(value)
+			if !isBool {
+				return errors.New("invalid bool value: " + value)
+			}
+
 		// Strict mode
 		case "strict":
 			var isBool bool
@@ -511,6 +529,8 @@ func parseDSNParams(cfg *Config, params string) (err error) {
 				}
 
 				if tlsConfig, ok := tlsConfigRegister[name]; ok {
+					tlsConfig = cloneTLSConfig(tlsConfig)
+
 					if len(tlsConfig.ServerName) == 0 && !tlsConfig.InsecureSkipVerify {
 						host, _, err := net.SplitHostPort(cfg.Addr)
 						if err == nil {