[scripts] Exclude shared_preferences_windows package

[franciscojma86]

Description

Includes shared_preferences_windows in the to avoid build failures caused by path dependencies.

Related Issues

flutter/flutter#44918

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[Sunbreak]

@franciscojma86 Does it mean that we'll have shared_preference_windows soon?

We're deliverying desktop APPs around and need it despreately.
https://github.com/woodemi/Flutter-SDK-Desktop
https://github.com/woodemi/Flutter-RTM-Desktop

Could you share any preview implementation?

[franciscojma86]

@Sunbreak Still a draft, but getting close #2631