Bump subosito/flutter-action from 2.19.0 to 2.21.0 in the github-actions group

[dependabot]

Bumps the github-actions group with 1 update: subosito/flutter-action.

Updates subosito/flutter-action from 2.19.0 to 2.21.0

Release notes

Sourced from subosito/flutter-action's releases.

v2.21.0

What's Changed

• Add cache hit outputs by @​beninato8 in subosito/flutter-action#364
• fix broken links in README by @​bartekpacia in subosito/flutter-action#365
• Support dynamic values for PUB-CACHE-PATH by @​beninato8 in subosito/flutter-action#363

New Contributors

• @​beninato8 made their first contribution in subosito/flutter-action#364

Full Changelog: subosito/flutter-action@v2.20.0...v2.21.0

v2.20.0

What's Changed

• perf: Only install yq on Windows if used by @​christerswahn in subosito/flutter-action#362
• use env if it existed by @​atishoo in subosito/flutter-action#360

New Contributors

• @​christerswahn made their first contribution in subosito/flutter-action#362
• @​atishoo made their first contribution in subosito/flutter-action#360

Full Changelog: subosito/flutter-action@v2...v2.20.0

Commits

• fd55f4c Support dynamic values for PUB-CACHE-PATH (#363)
• ca16aee fix broken links in README (#365)
• 947e9c9 Add cache hit outputs (#364)
• 395322a use env if it existed (#360)
• 02d6ac3 perf: Only install yq on Windows if used (#362)
• See full diff in compare view

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[github-actions]

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?

Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

Coverage ✔️

File	Coverage

This check for test coverage is informational (issues shown here will not fail the PR).

API leaks ✔️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols

License Headers ✔️

// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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[auto-submit]

autosubmit label was removed for dart-lang/http/1784, because - The status or check suite Format & Analyze & Test has failed. Please fix the issues identified (or deflake) before re-applying this label.