ci(gha): install cython, numpy bfore build cyarray

Since cyarray contains cython and numpy as build requirements in
pyproject.toml, pip should install cython and numpy install before
cyarray. See https://stackoverflow.com/a/54138355

However, it seems like this does not happen and the numpy import in
cyarray's setup.py fails with ModuleNotFoundError.

.github/workflows/tests.yml

@@ -28,7 +28,8 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip wheel
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install numpy 'cython<3.0'
           python -m pip install -r requirements.txt
           python setup.py develop
       - name: Run tests