fix np.float

[jdanz-psfc]

Before this change, we get the following error on modern NumPy versions:

Traceback (most recent call last):
  File "/usr/local/mdsplus/tdi/dev_support/MDSDEVICES.py", line 69, in MDSDEVICES
    ans += importDevices(module)
  File "/usr/local/mdsplus/tdi/dev_support/MDSDEVICES.py", line 40, in importDevices
    module = __import__(name)
  File "/usr/local/mdsplus/pydevices/RfxDevices/__init__.py", line 67, in <module>
    _mimport(filename[:-3])
  File "/usr/local/mdsplus/pydevices/RfxDevices/__init__.py", line 42, in _mimport
    module = __import__(name, globals(), level=level)
  File "/usr/local/mdsplus/pydevices/RfxDevices/MARTE2_PYTHON_PID.py", line 29, in <module>
    import pid
  File "/opt/MARTe2/MARTe2-MDSplus/GAMs/PyGAM/pid.py", line 31, in <module>
    y_1 = np.float(0.)
  File "/home/jdanz/.local/lib/python3.8/site-packages/numpy/__init__.py", line 305, in __getattr__
    raise AttributeError(__former_attrs__[attr])
AttributeError: module 'numpy' has no attribute 'float'.
`np.float` was a deprecated alias for the builtin `float`. To avoid this error in existing code, use `float` by itself. Doing this will not modify any behavior and is safe. If you specifically wanted the numpy scalar type, use `np.float64` here.
The aliases was originally deprecated in NumPy 1.20; for more details and guidance see the original release note at:
    https://numpy.org/devdocs/release/1.20.0-notes.html#deprecations

This commit resolves that error.