fix(ci): use setup-python version for pipenv virtualenv

The documentation workflow was failing because pipenv was using
the system Python 3.12 instead of the Python 3.10 installed by
actions/setup-python. This caused an ImportError when pipdeptree
tried to run in the virtualenv with a different Python version.

Fix by explicitly specifying --python  to ensure
pipenv creates the virtualenv with the correct Python version.

Fixes #1193

Signed-off-by: Vedant Madane <6527493+VedantMadane@users.noreply.github.com>

Author: VedantMadane

.github/workflows/documentation.yml

@@ -42,7 +42,7 @@ jobs:
           pipx install pipenv
       - name: Install dependencies
         run: |
-          pipenv install --dev
+          pipenv --python $(which python) install --dev
           pipenv install sphinx
           pipenv install sphinx_rtd_theme
       - name: Build docs