Update generate-requirements.yml

Add checkout of package and installation of python to workflow

.github/workflows/generate-requirements.yml

@@ -8,7 +8,14 @@ jobs:
   generate-requirements:
     runs-on: ubuntu-latest
     steps:
-      - name: Install Poetry
-        run: curl -sSL https://install.python-poetry.org | python3 -
-      - name: Export requirements.txt
-        run: poetry export --without-hashes --format=requirements.txt -o docs/requirements.txt -E docs -E notebook
+    - uses: actions/checkout@v3
+      with:
+        lfs: true
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v4
+      with:
+        python-version: 3.8
+    - name: Install Poetry
+      run: curl -sSL https://install.python-poetry.org | python3 -
+    - name: Export requirements.txt
+      run: poetry export --without-hashes --format=requirements.txt -o docs/requirements.txt -E docs -E notebook