use latest version of setup python

Author: engineerjoe440

.github/workflows/buildtest.yml

@@ -15,7 +15,7 @@ jobs:
       # https://github.com/marketplace/actions/setup-python
       # ^-- This gives info on matrix testing.
       - name: Install Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v4
         with:
           python-version: "3.11"
       # I don't know where the "run" thing is documented.