build(deps): bump actions/checkout from 3.3.0 to 3.5.2 (#389)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.3.0 to 3.5.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@ac59398...8e5e7e5)

---
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/conformance.yml

@@ -35,7 +35,7 @@ jobs:
         sdk: stable
     - run: dart --version
 
-    - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
+    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
     - run: dart pub upgrade
       working-directory: integration_test
 

.github/workflows/verify_examples.yml

@@ -41,7 +41,7 @@ jobs:
     - uses: dart-lang/setup-dart@a57a6c04cf7d4840e88432aad6281d1e125f0d46
       with:
         sdk: stable
-    - uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c
+    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab
     - run: dart --version
     - id: pub_get
       run: dart pub get