build(deps): bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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>

.github/workflows/check-reserved-keywords.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: setup python
       uses: actions/setup-python@v2

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         toxenv: [quality, docs, django42-drf315, django42-drflatest]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: setup python
       uses: actions/setup-python@v2
       with:

.github/workflows/migrations-check.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2

.github/workflows/pypi-publish.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: setup python
         uses: actions/setup-python@v2
         with: