Load all requirements for the zarr-dev build

Author: joshmoore

.github/workflows/zarr-dev.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Install dependencies
         shell: bash -l {0}
         run: |
-          python -m pip install --upgrade pip wheel pytest tox
+          python -m pip install -r requirements/requirements-dev.txt
           python -m pip install \
           git+https://github.com/zarr-developers/zarr-python.git@master