chore(deps): bump actions/checkout from 2 to 3.1.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.1.0.
- [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/v2...v3.1.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/hardware-metadata-validation.yml

@@ -18,8 +18,8 @@ jobs:
   check-metadata-format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+      - uses: actions/checkout@v3
       - uses: bahmutov/npm-install@v1
         with:
           working-directory: app
@@ -31,7 +31,7 @@ jobs:
     container:
       image: docker.io/zmkfirmware/zmk-dev-arm:3.0
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: pip install -r app/scripts/requirements.txt
       - name: West init