chore(deps): update dependency ubuntu_widgets to ^0.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu_widgets (source)	dependencies	minor	^0.2.0 -> ^0.3.0

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Release Notes

canonical/ubuntu-flutter-plugins (ubuntu_widgets)

### [`v0.3.3`](https://togithub.com/canonical/ubuntu-flutter-plugins/blob/HEAD/packages/ubuntu_widgets/CHANGELOG.md#033) [Compare Source](https://togithub.com/canonical/ubuntu-flutter-plugins/compare/ubuntu_widgets-v0.3.2...ubuntu_widgets-v0.3.3) - **FIX**: Remove Flexible from AnimatedExpanded. ### [`v0.3.2`](https://togithub.com/canonical/ubuntu-flutter-plugins/blob/HEAD/packages/ubuntu_widgets/CHANGELOG.md#032) [Compare Source](https://togithub.com/canonical/ubuntu-flutter-plugins/compare/ubuntu_widgets-v0.3.1...ubuntu_widgets-v0.3.2) - **FIX**: returning to original behavior, with a parameter ‘expanded’ to determine the width of the button. ### [`v0.3.1`](https://togithub.com/canonical/ubuntu-flutter-plugins/blob/HEAD/packages/ubuntu_widgets/CHANGELOG.md#031) [Compare Source](https://togithub.com/canonical/ubuntu-flutter-plugins/compare/ubuntu_widgets-v0.3.0...ubuntu_widgets-v0.3.1) - **REFACTOR**: Apply ubuntu lints to all packages ([#​340](https://togithub.com/canonical/ubuntu-flutter-plugins/issues/340)). - **FIX**: Remove and fix all unnecessary ignores. - **FEAT**: The MenuButtonBuilder should scale depending on his childrens. - **FEAT**: Activate ubuntu_lints. ### [`v0.3.0`](https://togithub.com/canonical/ubuntu-flutter-plugins/blob/HEAD/packages/ubuntu_widgets/CHANGELOG.md#030-2023-10-30) [Compare Source](https://togithub.com/canonical/ubuntu-flutter-plugins/compare/ubuntu_widgets-v0.2.1...ubuntu_widgets-v0.3.0) - **ubuntu_widgets:** use fixed padding for MenuButtonBuilder ([#​334](https://togithub.com/canonical/ubuntu-flutter-plugins/issues/334)) ([5856134](https://togithub.com/canonical/ubuntu-flutter-plugins/commit/5856134426d43b7590bce107e62a0841e1c6548f))

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