fix opencv version (#239)

* lock opencv and contrib versions to 4.9 and remove install_opencv script

* remove HAS_OMNIDIR test skip

* remove unused imports

* remove execution of removed script

* add upper bound for numpy

* lock poetry

* use headless opencv

* use headed opencv

* fix trailing whitespace

.github/workflows/pytest.yml

@@ -22,7 +22,6 @@ jobs:
       - name: install dependencies
         run: |
           poetry install --with dev
-          poetry run install-deps
       - name: pre-commit, mypy and pylint
         run: |
           poetry run pre-commit run --all-files
@@ -48,7 +47,6 @@ jobs:
       - name: install dependencies
         run: |
           poetry install --with dev
-          poetry run install-deps
           sudo apt-get update && sudo apt-get install -y v4l-utils psmisc libgl1-mesa-glx
       - name: test
         run: poetry run pytest