Update sdk constraint range and update runners (#1706)

place_tracker/web/index.html

@@ -32,6 +32,9 @@
   <title>place_tracker</title>
   <link rel="manifest" href="manifest.json">
 
+  <!-- Google Maps: https://pub.dev/packages/google_maps_flutter_web -->
+  <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>
+
   <script>
     // The value below is injected by flutter build, do not touch.
     var serviceWorkerVersion = null;