Update test.yml

Author: SiyaoIsHiding

.github/workflows/test.yml

@@ -25,10 +25,10 @@ jobs:
         uses: actions/checkout@v4
 
       # ---- Python for ccm ----
-      - name: Set up Python 3.9
+      - name: Set up Python 3.9.16
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.9.16'
 
       - name: Install ccm
         run: |