fix repo maintenance (#35534)

* ?

* . can't be used since then it will be modeld folder

.github/workflows/repo-maintenance.yaml

@@ -54,8 +54,9 @@ jobs:
         git add .
     - name: update car docs
       run: |
+        export PYTHONPATH="$PWD"
         scons -j$(nproc) --minimal opendbc_repo
-        PYTHONPATH=. python selfdrive/car/docs.py
+        python selfdrive/car/docs.py
         git add docs/CARS.md
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@9153d834b60caba6d51c9b9510b087acf9f33f83