Use the required version of package:win32 (#244)

Author: brianquinlan

pkgs/io_file/mobile_test/pubspec.yaml

@@ -29,7 +29,7 @@ dev_dependencies:
   logging: ^1.3.0
   native_toolchain_c: ^0.16.0
   path: ^1.9.1
-  win32: ^5.11.0
+  win32: ^5.13.0
   errno: ^1.4.1
   stdlibc:
     git:

pkgs/io_file/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
   meta: ^1.16.0
   native_toolchain_c: ^0.16.0
   path: ^1.9.1
-  win32: ^5.11.0
+  win32: ^5.13.0
 
 dev_dependencies:
   args: ^2.7.0