ci: try installing first

Author: G-Rath

.github/workflows/ci.yml

@@ -91,14 +91,14 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persist-credentials: false
-      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
-        with:
-          python-version-file: '.python-version'
       - # Workaround (hopefully temporary) issue with Poetry and virtualenv:
         # - https://github.com/pypa/virtualenv/issues/2931
         # - https://github.com/python-poetry/poetry/issues/10490
         # - https://github.com/actions/setup-python/issues/1167
         run: pip install virtualenv==20.32
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+        with:
+          python-version-file: '.python-version'
       - run: pipx install poetry~=2.0
       - run: poetry install
       - run: poetry run scripts/validate_advisories.py