Revert "Try separate install step"

This reverts commit 389833b.

Author: ndevenish

.github/workflows/build_and_test.yml

@@ -45,8 +45,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install dist/*.whl -r requirements_dev.txt
-          pip install pytest-md pytest-emoji
+          pip install pytest dist/*.whl -r requirements_dev.txt pytest-md pytest-emoji
       - name: Run pytest
         uses: pavelzw/pytest-action@b09a85cd1831cbaae76125fcae4a1e4b137ef026 # v2.1.3
         with: