actions: update python (#436)

* update python

* update checkout action

Author: larshp

.github/workflows/editorconfig.yml

@@ -30,6 +30,6 @@ jobs:
     name: Lint for editorconfig violations
     steps:
       - name: Checkout the repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Check for editorconfig violations
         uses: editorconfig-checker/action-editorconfig-checker@v1

.github/workflows/py-validation.yml

@@ -16,11 +16,11 @@ jobs:
     timeout-minutes: 10
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.6
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.6'
+        python-version: '3.7'
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel