Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index 5cfb737..2e3581b 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -20,7 +20,7 @@
       dev: ${{ steps.output.outputs.dev }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: dart-lang/setup-dart@v1
         id: dart
         with:
@@ -88,7 +88,7 @@
     steps:
       - run: git config --global core.autocrlf false
         if: runner.os == 'Windows'
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: dart-lang/setup-dart@v1
         with:
           sdk: ${{ matrix.dart-sdk }}