Read Python version from adk/pyproject.toml in copilot-setup-steps.yml

Co-authored-by: g3force <779094+g3force@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup Python
         uses: 'actions/setup-python@v6'
         with:
-          python-version: "3.14"
+          python-version-file: "adk/pyproject.toml"
           pip-install: "pre-commit"
 
       - name: Install dependencies