CI breaking due to numpy package

[timryanb]

CI seems to be failing with following message during unit test phase:

  File "/home/runner/work/mphys/mphys/tests/unit_tests/test_mask_converter.py", line 3, in <module>
    import numpy as np
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/__init__.py", line 149, in <module>
    from . import lib
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/lib/__init__.py", line 23, in <module>
    from . import index_tricks
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/lib/index_tricks.py", line 12, in <module>
    import numpy.matrixlib as matrixlib
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/matrixlib/__init__.py", line 4, in <module>
    from . import defmatrix
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/matrixlib/defmatrix.py", line 12, in <module>
    from numpy.linalg import matrix_power
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/linalg/__init__.py", line 73, in <module>
    from . import linalg
  File "/usr/share/miniconda/envs/OpenMDAO/lib/python3.9/site-packages/numpy/linalg/linalg.py", line 35, in <module>
    from numpy.linalg import _umath_linalg
ImportError: libgfortran.so.3: cannot open shared object file: No such file or directory