Bump subosito/flutter-action from 2.12.0 to 2.13.0

[dependabot[bot]]

Bumps subosito/flutter-action from 2.12.0 to 2.13.0.

Commits

• 62f096c Update README (#266)
• 8440825 Improvements to caching (#265)
• 14bf530 Set architecture options from runner's architecture (#264)
• 02b923c add support for the main channel (#258)
• aa6d9b9 update cache test
• See full diff in compare view

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[dependabot[bot]]

Superseded by #617.