chore(deps): update dependency ubuntu_widgets to ^0.3.0

[renovate]

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

Compare Source

• FIX: Remove Flexible from AnimatedExpanded.

v0.3.2

Compare Source

• FIX: returning to original behavior, with a parameter ‘expanded’ to determine the width of the button.

v0.3.1

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• REFACTOR: Apply ubuntu lints to all packages (#​340).
• FIX: Remove and fix all unnecessary ignores.
• FEAT: The MenuButtonBuilder should scale depending on his childrens.
• FEAT: Activate ubuntu_lints.

v0.3.0

Compare Source

• ubuntu_widgets: use fixed padding for MenuButtonBuilder (#​334) (5856134)

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