Use ubuntu-latest for the supported Python versions (#442)

Use ubuntu-22.04 only for Python 3.7-3.8
by including them separately into the matrix.

.github/workflows/main.yml

@@ -4,29 +4,40 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     strategy:
-      max-parallel: 4
+      max-parallel: 6
       matrix:
-        python-version: [3.7, 3.8]
+        # ubuntu-22.04 supports Python 3.7-3.12
+        # ubuntu-24.04 (currently latest & preferred) supports Python 3.9-3.12
+        # More details: https://github.com/actions/runner-images/issues/10636
+        os: [ubuntu-latest]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        include:
+          - os: ubuntu-22.04
+            python-version: "3.7"
+          - os: ubuntu-22.04
+            python-version: "3.8"
+    runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Setup Graphviz
-      uses: ts-graphviz/setup-graphviz@v1
+      uses: ts-graphviz/setup-graphviz@v2
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install .
     - name: Create Examples
-      run: PYTHONPATH=$(pwd)/src:$PYTHONPATH cd src/wireviz/ && python build_examples.py
+      run: PYTHONPATH=$(pwd)/src/wireviz:$PYTHONPATH cd src/wireviz/ && python build_examples.py
     - name: Upload examples, demos, and tutorials
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
-        name: examples-and-tutorials
+        name: examples-and-tutorials-v${{ matrix.python-version }}
         path: |
           examples/
           tutorial/
+        if-no-files-found: error
+