feat: widen win32 and package_info_plus dependency constraints

- Update win32 from `>=5.6.1 <6.0.0` to `>=5.6.1 <7.0.0`
- Update package_info_plus from `^9.0.0` to `>=9.0.0 <11.0.0`

No code changes required — the Windows plugin uses only
`SetThreadExecutionState` with `ES_CONTINUOUS` and `ES_DISPLAY_REQUIRED`,
which are fully compatible with win32 6.x (`EXECUTION_STATE` extension
type implements `int`).

Closes #120

Author: dbebawy

wakelock_plus/pubspec.yaml

@@ -18,12 +18,11 @@ dependencies:
   wakelock_plus_platform_interface: ^1.4.0
 
   # Windows dependencies
-  # win32 is compatible across v5 for Win32 only (not COM)
-  win32: ">=5.6.1 <6.0.0"
+  win32: ">=5.6.1 <7.0.0"
 
   # Linux dependencies
   dbus: ^0.7.12
-  package_info_plus: ^9.0.0
+  package_info_plus: ">=9.0.0 <11.0.0"
 
   # Web dependencies
   web: ">=0.5.1 <2.0.0"