Bump actions/checkout from 3 to 4

.github/workflows/code_style.yml

@@ -7,7 +7,7 @@ jobs:
     name: Quality check
     runs-on: ubuntu-18.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python
         uses: actions/[email protected]
         with:

.github/workflows/pypi_install.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           python-version: '3.8'
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
         run: pip install wheel
       - name: Build package

.github/workflows/pytest.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       # Setup and installation
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup python
         uses: actions/[email protected]
         with:

.github/workflows/test_install.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install amstrax
         run: |
             pip install -r requirements.txt