chore(deps): update dependency handy_window to ^0.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
handy_window	dependencies	minor	^0.3.1 -> ^0.4.0

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Release Notes

ubuntu-flutter-community/handy_window (handy_window)

### [`v0.4.0`](https://togithub.com/ubuntu-flutter-community/handy_window/blob/HEAD/CHANGELOG.md#040-2024-03-09) [Compare Source](https://togithub.com/ubuntu-flutter-community/handy_window/compare/v0.3.1...v0.4.0)

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