ci: fix incorrect python version being used in github workflow

Author: pjhartzell

.github/workflows/pr.yml

@@ -12,11 +12,11 @@ jobs:
         python-version: ["3.12"]
     steps:
       - uses: actions/checkout@v4
-      - run: pipx install poetry==1.7.1
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           cache: poetry
+      - run: pip install poetry==1.7.1
       - name: Install dependencies
         run: poetry install --with=dev
       - name: Lint code