Add support for binding to IPv6 localhost in `flutter run` (#13136)

This allows `flutter run` to work on hosts that are IPv6-only.

packages/flutter_tools/lib/src/run_cold.dart

diff --git a/packages/flutter_tools/lib/src/run_cold.dart b/packages/flutter_tools/lib/src/run_cold.dart
index 713d61c..7a004f2 100644
--- a/packages/flutter_tools/lib/src/run_cold.dart
+++ b/packages/flutter_tools/lib/src/run_cold.dart
@@ -22,11 +22,13 @@
     this.applicationBinary,
     this.previewDart2 : false,
     bool stayResident: true,
+    bool ipv6: false,
   }) : super(devices,
              target: target,
              debuggingOptions: debuggingOptions,
              usesTerminalUI: usesTerminalUI,
-             stayResident: stayResident);
+             stayResident: stayResident,
+             ipv6: ipv6);
 
   final bool traceStartup;
   final String applicationBinary;