all: use any instead of interface{}

My favorite part of generics.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

net/dns/resolver/tsdns.go

@@ -711,7 +711,7 @@ type response struct {
 }
 
 var dnsParserPool = &sync.Pool{
-	New: func() interface{} {
+	New: func() any {
 		return new(dnsParser)
 	},
 }