Update test action (#359)

* Update test action

* fix older versions

* fix action

.github/workflows/tests.yml

@@ -19,18 +19,23 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        python-version: [ '3.5', '3.6', '3.7', '3.8', '3.9', '3.10' ]
+        python-version: [ '3.7', '3.8', '3.9', '3.10' ]
+        operating-system: [ 'ubuntu-latest' ]
+        include:
+          - python-version: 3.5
+            operating-system: ubuntu-20.04
+          - python-version: 3.6
+            operating-system: ubuntu-20.04
     name: Tests (Python ${{ matrix.python-version }})
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-          architecture: x64
       - name: Install Pytest
         run: |
           pip install --upgrade pip
@@ -41,4 +46,4 @@ jobs:
         run: |
           cd tests
           ./run_tests.sh
-        shell: bash
+        shell: bash