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] <[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 }}
@@ -40,7 +40,7 @@ jobs:
       matrix:
         python-version: ["3.12"]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}

.github/workflows/mysql8-migrations-check.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Setup Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2