Update dart-lang/setup-dart action to v1.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dart-lang/setup-dart	action	minor	v1.4 → v1.8.0

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Release Notes

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

v1.8.0

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• Add a problem matcher for dart analyze to automatically create inline annotations on GitHub pull requests.
• Update publish.yml reusable workflow to reference setup-dart@v1.7.2 (running on Node 24) (#​188).
• Update GitHub Action dependencies (actions/checkout v7).
• Bump undici to 6.27.0 and update npm dependencies.

v1.7.2

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• Update Node.js requirement to Node 24.
• Fix open Dependabot alerts by bumping undici to >=6.24.0.
• Update GitHub Action dependencies (@actions/core, @actions/exec, @actions/tool-cache, @actions/http-client).
• Update workflow actions to their latest versions (actions/checkout v6, setup-flutter).

v1.7.1

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• Roll undici dependency to address CVE-2025-22150.
• Update to the latest npm dependencies.
• Recompile the action using the new Dart / JavaScript interop.

v1.7.0

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• Install flutter sdk in publishing step, allowing Flutter packages to be
  published (#​68)

v1.6.5

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• Fix zip path handling on Windows 11 (#​118)

v1.6.4

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• Rebuild JS code.

v1.6.3

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• Roll undici dependency to address CVE-2024-30260 and CVE-2024-30261.

v1.6.2

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• Switch to running the workflow on node20`` from node16`. See also
  Transitioning from Node 16 to Node 20.

v1.6.1

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• Updated the google storage url for main channel releases.

v1.6.0

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• Enable provisioning of the latest Dart SDK patch release by specifying just
  the major and minor version (e.g. 3.2).

v1.5.1

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• No longer test the setup-dart action on pre-2.12 SDKs.
• Upgrade JS interop code to use extension types
  (the new name for inline classes).
• The upcoming rename of the be channel to main is now supported with
  forward compatibility that switches when the rename happens.

v1.5.0

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• Re-wrote the implementation of the action into Dart.
• Auto-detect the platform architecture (x64, ia32, arm, arm64).
• Improved the caching and download resilience of the sdk.
• Added a new action output: dart-version - the installed version of the sdk.

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