Version 6.0.0 of package_info_plus required for third-party SDK requirements by Apple

[nicolobozzato]

Now Apple requires a privacy manifest for package:info_plus
https://developer.apple.com/support/third-party-SDK-requirements/

This has been added in version 6.0.0
https://pub.dev/packages/package_info_plus/changelog
So this package if the dependencies are not upgraded makes a flutter app not deployable on App Store in the future (a very close future Spring 2024, should be May)

This also may solve #80