ci(linting): sparse github-action steps

This commit linting github-action workflow
code.

Author: diodonfrost

.github/workflows/CI.yml

@@ -50,13 +50,17 @@ jobs:
             python-version: 3.7
 
     steps:
-      - uses: actions/checkout@master
-      - name: Set up Python
-        uses: actions/setup-python@v1
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Python version
+        uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.config.python-version }}
+
       - name: Install dependencies
         run: python -m pip install tox==3.20.0
+
       - name: Python test
         run: tox
         env: