chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/django_on_diff_os.yml

@@ -18,7 +18,7 @@ jobs:
         python_version: [3.7, 3.8]
         os: [macos-latest, windows-latest, ubuntu-latest]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python_version }}
       uses: actions/setup-python@v2
       with:

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-node@v1
       with:
         node-version: 12.16.3

.github/workflows/simple.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     if: startsWith(github.head_ref, 'renovate') == false
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8
@@ -28,7 +28,7 @@ jobs:
   black:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8
@@ -42,7 +42,7 @@ jobs:
   isort:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8
@@ -56,7 +56,7 @@ jobs:
   security:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8
@@ -88,7 +88,7 @@ jobs:
         django-version: ["~=2.2.0", "~=3.0.0"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
@@ -112,7 +112,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: docker build
       run: docker build . --file Dockerfile -t ${{ github.repository }} -t ${{ github.repository }}:$(date +%s)