Bump actions/checkout from 3.5.2 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.5.2 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.5.2...v4.1.6)

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

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

.github/workflows/sphinx.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       # check out sources that will be used for autodocs, plus readme
       - name: Checkout
-        uses: actions/checkout@v3.5.2
+        uses: actions/checkout@v4.1.6
 
       - name: Install rsync
         run: |

.github/workflows/test_and_deploy.yml

@@ -26,7 +26,7 @@ jobs:
         python-version: [3.8, 3.9, '3.10']
 
     steps:
-      - uses: actions/checkout@v3.5.2
+      - uses: actions/checkout@v4.1.6
 
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     if: contains(github.ref, 'tags')
     steps:
-      - uses: actions/checkout@v3.5.2
+      - uses: actions/checkout@v4.1.6
       - name: Set up Python
         uses: actions/setup-python@v4
         with: