Update actions/setup-python to use pyproject.toml (#2020)

Author: rhysyngsun

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
 
       - uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5
         with:
-          python-version: "3.12.6"
+          python-version-file: "pyproject.toml"
           cache: "poetry"
 
       - name: Validate lockfile