TUN-8685: Bump coredns dependency

Closes TUN-8685

vendor/github.com/miekg/dns/xfr.go

@@ -44,7 +44,6 @@ func (t *Transfer) tsigProvider() TsigProvider {
 //	dnscon := &dns.Conn{Conn:con}
 //	transfer = &dns.Transfer{Conn: dnscon}
 //	channel, err := transfer.In(message, master)
-//
 func (t *Transfer) In(q *Msg, a string) (env chan *Envelope, err error) {
 	switch q.Question[0].Qtype {
 	case TypeAXFR, TypeIXFR:
@@ -81,8 +80,13 @@ func (t *Transfer) In(q *Msg, a string) (env chan *Envelope, err error) {
 
 func (t *Transfer) inAxfr(q *Msg, c chan *Envelope) {
 	first := true
-	defer t.Close()
-	defer close(c)
+	defer func() {
+		// First close the connection, then the channel. This allows functions blocked on
+		// the channel to assume that the connection is closed and no further operations are
+		// pending when they resume.
+		t.Close()
+		close(c)
+	}()
 	timeout := dnsTimeout
 	if t.ReadTimeout != 0 {
 		timeout = t.ReadTimeout
@@ -132,8 +136,13 @@ func (t *Transfer) inIxfr(q *Msg, c chan *Envelope) {
 	axfr := true
 	n := 0
 	qser := q.Ns[0].(*SOA).Serial
-	defer t.Close()
-	defer close(c)
+	defer func() {
+		// First close the connection, then the channel. This allows functions blocked on
+		// the channel to assume that the connection is closed and no further operations are
+		// pending when they resume.
+		t.Close()
+		close(c)
+	}()
 	timeout := dnsTimeout
 	if t.ReadTimeout != 0 {
 		timeout = t.ReadTimeout