Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/basic.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:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v2
       with:
         python-version: 3.8
@@ -70,7 +70,7 @@ 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
@@ -95,7 +95,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
 
     - name: docker build
       run: docker build -t python-demo .