fixed harmless typo in workflow

Author: rgaudin

.github/workflows/QA.yaml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Python ${{ matrix.python }}
+      - name: Set up Python
         uses: actions/setup-python@v5
         with:
           # to update to 3.13 once it lands in GH image