Bump http from 0.13.6 to 1.0.0 in /google_maps (#1833)

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Bumps [http](https://github.com/dart-lang/http/tree/master/pkgs) from
0.13.6 to 1.0.0.
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google_maps/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
   cupertino_icons: ^1.0.2
   google_maps_flutter: ^2.2.1
   google_maps_flutter_web: ^0.4.0+3
-  http: ^0.13.5
+  http: ^1.0.0
   json_annotation: ^4.7.0
   json_serializable: ^6.5.4