Chore(deps): Bump actions/checkout from 3 to 4 (#598)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

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

.github/workflows/cicd.yaml

@@ -39,7 +39,7 @@ jobs:
 
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Setup Python (faster than using Python container)
       - name: Setup Python
@@ -73,6 +73,6 @@ jobs:
   test-docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Test generating docs
         run: make docs

.github/workflows/deploy_mkdocs.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout main
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python 3.8
         uses: actions/setup-python@v4

.github/workflows/publish.yml

@@ -10,7 +10,7 @@ jobs:
     name: release
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python 3.x
         uses: actions/setup-python@v4