build(deps): bump actions/checkout from 1 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 1 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v1...v4)

---
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/ci.yml

@@ -14,7 +14,7 @@ jobs:
         python-version: ["3.12"]
         django-version: ["pinned"]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}

.github/workflows/docker-publish.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Build and Push docker image
         env:

.github/workflows/upgrade-python-requirements.yml

@@ -22,7 +22,7 @@ jobs:
       - name: setup target branch
         run: echo "target_branch=$(if ['${{ github.event.inputs.branch }}' = '']; then echo 'main'; else echo '${{ github.event.inputs.branch }}'; fi)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
         with:
           ref: ${{ env.target_branch }}