chore(deps): update dart-lang/setup-dart action to v1.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
dart-lang/setup-dart	action	minor	v1.3 -> v1.4

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Release Notes

dart-lang/setup-dart (dart-lang/setup-dart)

v1.4

Compare Source

• Automatically create OIDC token for pub.dev.
• Add a reusable workflow for publishing.

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Configuration

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• [ ] If you want to rebase/retry this PR, check this box

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