Change ubuntu version in github actions and update its python version to be compatible

Author: giuluck

.github/workflows/main.yml

@@ -10,18 +10,24 @@ jobs:
                 # * test on different operative systems
                 # * test minimal versions: python 3.8.0 + lowest full requirements (of direct packages only)
                 # * test latest versions: python 3.x + latest full requirements
-                os: ["windows-2022", "macos-13", "ubuntu-20.04"]
-                versions: [["3.8.0", "--resolution lowest-direct .[full]"], ["3.x", ".[full]"]]
-        runs-on: ${{ matrix.os }}
+                environment: [
+                  ["windows-2022", "3.8.0", "--resolution lowest-direct .[full]"],
+                  ["windows-2022", "3.x", ".[full]"],
+                  ["macos-13", "3.8.0", "--resolution lowest-direct .[full]"],
+                  ["macos-13", "3.x", ".[full]"],
+                  ["ubuntu-24.04", "3.8.12", "--resolution lowest-direct .[full]"]
+                  ["ubuntu-24.04", "3.x", ".[full]"]
+                ]
+        runs-on: ${{ matrix.environment[0] }}
         steps:
             - uses: actions/checkout@v4
             - uses: actions/setup-python@v5
               with:
-                python-version: ${{ matrix.versions[0] }}
+                python-version: ${{ matrix.environment[1] }}
             - name: Install Dependencies
               run: |
                 python -m pip install --upgrade pip pytest uv
-                uv pip install --upgrade ${{ matrix.versions[1] }} --system
+                uv pip install --upgrade ${{ matrix.environment[2] }} --system
             - name: Print Versions
               run: |
                 python --version