Update numpy version to 1.19.3

[dakotabenjamin]

Fixes compatibility error with pandas:

ERROR: Cannot install numpy==1.17.3 and pandas==1.3.4 because these package versions have conflicting dependencies.

The conflict is caused by:
    The user requested numpy==1.17.3
    pandas 1.3.4 depends on numpy>=1.19.2; platform_machine == "aarch64" and python_version < "3.10"

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies