Update python and action versions in linting checks.

.github/workflows/linting.yml

@@ -9,9 +9,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.8
 
       - name: Install dependencies
         run: |