Fix Rive not updating

[syleishere]

Description

Quick rive pubspec fix, there was no "^" on rive's pubspec line, so could break it on future flutter versions. I think without 0.13.20 it does break flutter 3.27+ if I remember right.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

• I signed the CLA.
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing tests pass locally with my changes
• I have made corresponding changes to the documentation (if applicable)

Summary by Sourcery

Bug Fixes:

• Fix the Rive dependency version in the pubspec.yaml to ensure compatibility with future Flutter versions by using a caret (^) to allow for non-breaking updates.

[FeodorFitsner]

Bumping to 0.13.20 is OK, but I'd remove ^ anyway. Going forward we want to pin Flet dependencies to a specific version and manually update their versions. There is always either some package "patch" update or Flutter release that breaks the packaging.