Bump actions/checkout from 2 to 3 (#60)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

.github/workflows/docs-deploy.yml

@@ -9,8 +9,8 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v2
-        # If you're using actions/checkout@v2 you must set persist-credentials to false in most cases for the deployment to work correctly.
+        uses: actions/checkout@v3
+        # If you're using actions/checkout@v3 you must set persist-credentials to false in most cases for the deployment to work correctly.
         with:
           persist-credentials: false
       - uses: actions/setup-python@v4