Github: Backport action changes to 2.4.0 release

Author: ikelos

.github/workflows/build-pypi.yml

@@ -15,14 +15,16 @@ on:
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: ["3.6"]
     steps:
-    - uses: actions/checkout@v2
-
-    - name: Set up Python 3.x
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.x'
+        python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: |

.github/workflows/test.yaml

@@ -3,14 +3,16 @@ on: [push, pull_request]
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        python-version: ["3.6"]
     steps:
-    - uses: actions/checkout@v2
-
-    - name: Set up Python 3.6
-      uses: actions/setup-python@v2
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
       with:
-        python-version: '3.6'
+        python-version: ${{ matrix.python-version }}
 
     - name: Install dependencies
       run: |