Update dependency handy_window to ^0.2.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
handy_window	dependencies	minor	^0.1.2 -> ^0.2.0

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Release Notes

ubuntu-flutter-community/handy_window

### [`v0.2.0`](https://togithub.com/ubuntu-flutter-community/handy_window/blob/HEAD/CHANGELOG.md#​020) [Compare Source](https://togithub.com/ubuntu-flutter-community/handy_window/compare/v0.1.9...v0.2.0) - Add soft light border in dark theme ([#​20](https://togithub.com/ubuntu-flutter-community/handy_window/issues/20)).

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Configuration

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