Update templates/flutter/pubspec.yaml.twig

Co-authored-by: Damodar Lohani <lohanidamodar@users.noreply.github.com>

Author: 2002Bishwajeet

templates/flutter/pubspec.yaml.twig

@@ -21,7 +21,7 @@ dependencies:
   cookie_jar: ^4.0.2
   device_info_plus: ^9.0.2
   flutter_web_auth_2: ^2.1.4
-  http: '>=0.13.5 <1.0.1'
+  http: '>=0.13.6 <1.0.1'
   package_info_plus: ^4.0.2
   path_provider: ^2.0.14
   web_socket_channel: ^2.4.0