Bump actions/checkout from 3.3.0 to 3.5.0 (#43)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.3.0 to 3.5.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@ac59398...8f4b7f8)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dart.yml

@@ -21,7 +21,7 @@ jobs:
       image:  google/dart:dev
 
     steps:
-    - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
+    - uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3
     - name: Print Dart version
       run: dart --version
     - name: Install dependencies