net: remove unnecessary loop variable copies in tests

Similar to CL 711640.

Author: plamerdimak

src/net/lookup_windows_test.go

@@ -30,9 +30,7 @@ func toJson(v any) string {
 
 func testLookup(t *testing.T, fn func(*testing.T, *Resolver, string)) {
 	for _, def := range []bool{true, false} {
-		def := def
 		for _, server := range nslookupTestServers {
-			server := server
 			var name string
 			if def {
 				name = "default/"

src/net/unixsock_windows_test.go

@@ -20,7 +20,6 @@ func TestUnixConnLocalWindows(t *testing.T) {
 	}
 	handler := func(ls *localServer, ln Listener) {}
 	for _, laddr := range []string{"", testUnixAddr(t)} {
-		laddr := laddr
 		taddr := testUnixAddr(t)
 		ta, err := ResolveUnixAddr("unix", taddr)
 		if err != nil {

src/net/url/url_test.go

@@ -876,7 +876,6 @@ func TestURLRedacted(t *testing.T) {
 	}
 
 	for _, tt := range cases {
-		t := t
 		t.Run(tt.name, func(t *testing.T) {
 			if g, w := tt.url.Redacted(), tt.want; g != w {
 				t.Fatalf("got: %q\nwant: %q", g, w)