chore(deps): update actions/checkout action to v4 (#349)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/labeler_workflow.yml

@@ -15,7 +15,7 @@ jobs:
 #      matrix:
 #        python-version: [ '3.6','3.7', '3.8' ]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:

.github/workflows/unittest.yml

@@ -11,7 +11,7 @@ jobs:
         python-version: ['3.6','3.7', '3.8']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: