CI: Use setup-python@v4

(cherry picked from commit c7a30aec030c23f088fa3b1e90fcd695c9de5349)

.github/workflows/ci.yml

@@ -59,7 +59,7 @@ jobs:
           submodules: recursive
 
       - name: Set up Python (for SCons)
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.x'