Trying to pin tables package.

.github/workflows/test_and_build.yml

@@ -49,7 +49,7 @@ jobs:
             - name: Install dependencies
               run: |
                   python -m pip install --upgrade pip wheel
-                  pip install --upgrade flake8 coverage pytest-cov cython
+                  pip install --upgrade flake8 coverage pytest-cov cython "tables==3.7.0"
                   pip install git+https://github.com/EconForge/interpolation.py.git
                   pip install -e .
             - name: Lint with flake8