Fix periodic CI job

Just running make update-deps doesn't work, since uv refuses to run
outside of a virtualenv by default. Go back to using neophile.

Fix the Python version for running tox in the periodic CI workflow.

.github/workflows/periodic-ci.yaml

@@ -25,18 +25,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Python
-        uses: actions/setup-python@v5
+      - name: Run neophile
+        uses: lsst-sqre/run-neophile@v1
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-
-      - name: Update dependencies
-        run: make update-deps
+          mode: update
 
       - name: Run tests in tox
         uses: lsst-sqre/run-tox@v1
         with:
-          python-version: ${{ matrix.python }}
+          python-version: ${{ env.PYTHON_VERSION }}
           tox-envs: "lint,typing,py"
           tox-plugins: tox-uv
           use-cache: false