Fix CI so that it actually runs on the correct python version

Author: xvaier

.github/workflows/tests.yml

@@ -4,6 +4,7 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         python-version: [
           '3.8',
@@ -20,12 +21,10 @@ jobs:
     name: Python ${{ matrix.python-version }} ${{ matrix.post-venv }}
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/setup-python@v5
-      with:
-        python-version: ${{ matrix.python-version }}
-        architecture: x64
     - name: Install uv
       uses: astral-sh/setup-uv@v7
+      with:
+        python-version: ${{ matrix.python-version }}
     - run: make venv
     - if: ${{ matrix.post-venv }}
       run: ${{ matrix.post-venv }}