Update pull-requests.yml

.github/workflows/pull-requests.yml

@@ -15,7 +15,9 @@ jobs:
     - uses: actions/checkout@v3
 
     - uses: actions/setup-python@v3
-
+      with:
+        python-version: '3.10'
+        
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip