fix(deps): update dependency flutter_spinkit to v5

[timoknapp]

This PR contains the following updates:

Package	Type	Update	Change
flutter_spinkit	dependencies	major	^4.0.0 -> ^5.0.0

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Release Notes

jogboms/flutter_spinkit

### [`v5.0.0`](https://togithub.com/jogboms/flutter_spinkit/blob/master/CHANGELOG.md#​500) [Compare Source](https://togithub.com/jogboms/flutter_spinkit/compare/v4.1.2...v5.0.0) - Migrate to null safety

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