Freeze numpy version

[pyalex]

Signed-off-by: Oleksii Moskalenko [email protected]

What this PR does / why we need it:

Latest numpy release (1.20.0) cause issue in pandas -> pyarrow conversion

/usr/local/lib/python3.7/site-packages/pyarrow/pandas_compat.py:588: in dataframe_to_arrays
    for c, f in zip(columns_to_convert, convert_fields)]/usr/local/lib/python3.7/site-packages/_pytest/compat.py:340: PytestDeprecationWarning: The TerminalReporter.writer attribute is deprecated, use TerminalReporter._tw instead at your own risk.
See https://docs.pytest.org/en/stable/deprecations.html#terminalreporter-writer for more information.
  return getattr(object, name, default)
/usr/local/lib/python3.7/site-packages/pyarrow/pandas_compat.py:588: in <listcomp>
    for c, f in zip(columns_to_convert, convert_fields)]
/usr/local/lib/python3.7/site-packages/pyarrow/pandas_compat.py:574: in convert_column
    raise e
/usr/local/lib/python3.7/site-packages/pyarrow/pandas_compat.py:568: in convert_column
    result = pa.array(col, type=type_, from_pandas=True, safe=safe)
pyarrow/array.pxi:292: in pyarrow.lib.array
    ???
pyarrow/array.pxi:83: in pyarrow.lib._ndarray_to_array
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
>   ???
E   pyarrow.lib.ArrowTypeError: ('Did not pass numpy.dtype object', 'Conversion failed for column datetime with type datetime64[ns, UTC]')
pyarrow/error.pxi:107: ArrowTypeError

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

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