Test Python 3.8; upgrade CI actions

Author: andreped

.github/workflows/tests_quick.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.6
-        uses: actions/setup-python@v4
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.6
+          python-version: 3.8
 
       - name: Install dependencies
         run: pip install wheel setuptools
@@ -39,7 +39,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python 3.8
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.8
 
@@ -65,7 +65,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python 3.8
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: 3.8