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

Author: renovate[bot]

.github/workflows/python-ci.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: [3.9]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setting up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:

.github/workflows/sonarcloud.yml

@@ -13,7 +13,7 @@ jobs:
         python-version: [3.9]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Setting up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with: