Merge pull request prometheus#13503 from tylitianrui/chore/remove_red…

…undance

remove redundant code

discovery/legacymanager/manager_test.go

@@ -1090,7 +1090,6 @@ func TestCoordinationWithReceiver(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.title, func(t *testing.T) {
 			ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 			defer cancel()