Update actions/setup-python action to v6 (#20)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build_tests.yml

@@ -11,7 +11,7 @@ jobs:
         with:
           ref: ${{ github.head_ref }}
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v6
         with:
           python-version: 3.11
       - name: Install Build Tools