Update actions/setup-python action to v3

.github/workflows/pull-requests.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v3
 
     - name: Install dependencies
       run: |
@@ -35,7 +35,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - uses: actions/setup-python@v2
+    - uses: actions/setup-python@v3
 
     - name: Build PR release
       run: |