Fix license updater workflow (#622)

.github/workflows/update_licenses.yml

@@ -17,17 +17,30 @@ jobs:
         with:
           python-version: "3.10"
 
+      - name: Bootstrap poetry
+        run: |
+          curl -sSL https://install.python-poetry.org | python - -y
+
+      - name: Update PATH
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Configure poetry
+        run: poetry config virtualenvs.in-project true
+
+      - name: Install dependencies
+        run: poetry install
+
+      - name: Update licenses list
+        run: |
+          poetry run python src/poetry/core/spdx/helpers.py
+
       - name: Generate token
         id: generate_token
         uses: tibdex/github-app-token@v1
         with:
           app_id: ${{ secrets.POETRY_TOKEN_APP_ID }}
           private_key: ${{ secrets.POETRY_TOKEN_APP_KEY }}
 
-      - name: Update licenses list
-        run: |
-          python src/poetry/core/spdx/helpers.py
-
       - name: Create PR if necessary
         uses: peter-evans/create-pull-request@v5
         with: