[CI] Fix CI on cuda env (#1905)

* fix ci

* remove spconv in optional.txt

.circleci/test.yml

@@ -105,8 +105,8 @@ jobs:
           name: Install mmdet3d dependencies
           command: |
             docker exec mmdet3d pip install -e /mmengine
-            docker exec pip install -U openmim
-            docker exec mim install 'mmcv >= 2.0.0rc1'
+            docker exec mmdet3d pip install -U openmim
+            docker exec mmdet3d mim install 'mmcv >= 2.0.0rc1'
             docker exec mmdet3d pip install -e /mmdetection
             docker exec mmdet3d pip install -r requirements.txt
       - run:

requirements/optional.txt

 black==20.8b1 # be compatible with typing-extensions 3.7.4
-spconv
 typing-extensions==3.7.4 # required by tensorflow<=2.6
 waymo-open-dataset-tf-2-6-0 # requires python>=3.7