chore: upgrade gh actions

- actions/setup-python@v1 -> actions/setup-python@v4
- actions/checkout@v2 -> actions/checkout@v3

Author: UlisesGascon

.github/workflows/push.yml

@@ -8,9 +8,9 @@ jobs:
       matrix:
         python-version: [2.7, 3.7]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies