chore(deps): update actions/setup-python action to v6

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: 3.14
       - name: Install Build Tools