Upgrade workflow Python and Ubuntu versions.

.github/workflows/main.yaml

@@ -10,8 +10,8 @@ jobs:
   tests:
     strategy:
       matrix:
-        python: ["3.5", "3.6", "3.8"]
-    runs-on: ubuntu-20.04
+        python: ["3.8", "3.10", "3.12"] #3.10
+    runs-on: ubuntu-22.04 #ubuntu:jammy-20231004
     container: "python:${{matrix.python}}-slim-buster"
     steps:
       - uses: actions/checkout@v3
@@ -52,7 +52,7 @@ jobs:
         uses: codecov/codecov-action@v3
 
   test-dockerization:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-22.04 #ubuntu:jammy-20231004
     steps:
       - uses: actions/checkout@v3
 
@@ -72,14 +72,14 @@ jobs:
     strategy:
       matrix:
         toxenv: [style, requirements, sanitizer]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04 #ubuntu:jammy-20231004
     steps:
       - uses: actions/checkout@v3
 
       - name: Setup Python
         uses: actions/[email protected]
         with:
-          python-version: "3.5"
+          python-version: "3.10" #3.10
 
       - name: Install GDAL
         run: sudo apt-get install -y gdal-bin