Revert "cI: attempt again to use uv to install python"

This reverts commit b30f227.

Author: psychedelicious

.github/workflows/python-tests.yml

@@ -87,9 +87,11 @@ jobs:
           enable-cache: true
           python-version: ${{ matrix.python-version }}
 
-      - name: install python
+      - name: setup python
         if: ${{ steps.changed-files.outputs.python_any_changed == 'true' || inputs.always_run == true }}
-        run: uv python install ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
 
       - name: install dependencies
         if: ${{ steps.changed-files.outputs.python_any_changed == 'true' || inputs.always_run == true }}