ci: swap to use tox gh actions instead of the archived coactions dynamic-matrix which wasnt working anymore

Author: studioj

.github/workflows/tox.yml

@@ -8,7 +8,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '3.14']
+        python-version:
+          - '3.10'
+          # - '3.11'
+          # - '3.12'
+          # - '3.14'
 
     steps:
       - uses: actions/checkout@v5
@@ -25,4 +29,5 @@ jobs:
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install tox tox-gh-actions
       - name: Test with tox
-        run: tox
+        # run only the env that matches the runner Python (e.g. 3.10 -> py310)
+        run: tox -e ${{ 'py' + matrix.python-version.replace('.','') }}