ci: Add absolute path to poetry

poetry gets installed in a virtual environment.

Signed-off-by: Peter Neuroth <[email protected]>

.github/workflows/docs-action.yml

@@ -47,7 +47,7 @@ jobs:
       - name: Install dependencies
         run: |
           cd libs/gl-client-py/
-          poetry export --without-hashes --with=docs > /tmp/requirements.txt
+          .venv/bin/poetry export --without-hashes --with=docs > /tmp/requirements.txt
           .venv/bin/pip install -U -r /tmp/requirements.txt
           
       - name: Build and install gl-client-py