fix(package_info_plus): relax win32 dependency constraint

[GianSandoval5]

Description

This PR relaxes the win32 dependency constraint in package_info_plus from ^6.0.1 to >=5.15.0 <7.0.0.

The current constraint requires win32 6.x, which prevents package_info_plus from resolving alongside packages that still depend on win32 5.x, such as recent file_picker versions. This change allows both win32 5.15.x and 6.x, improving dependency compatibility without changing plugin behavior.

Related Issues

No related issue.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

[GianSandoval5]

The macOS integration test built the example app successfully and passed fromPlatform, but failed while foregrounding the app:

ERROR: Failed to foreground app; open returned 1

This does not appear related to the dependency constraint change, since the dependency resolution and macOS build completed successfully.

[GianSandoval5]

The Android integration test resolved dependencies and built the APK successfully:

✓ Built build/app/outputs/flutter-apk/app-debug.apk

The job was canceled while installing the APK on the emulator after a long runtime, so this appears to be CI/emulator related rather than caused by the win32 constraint change.

[GianSandoval5]

cerrado porque el paquete requiere otros cambios al agregar >=5.15.0 <7.0.0.