[BUG] Numpy min. version is not respected by pip and conda.

[willGraham01]

Describe the bug
The numpy dependency (min 1.20.0) for meshio version 5.3.4 is not respected by pip or conda installs.

As such, it is possible to obtain an environment in which the bug in #1283 is present and not flagged by tools such as pip check, for example.

To Reproduce
Minimal steps to reproduce:

In a clean mamba/conda environment with python 3.9, running

pip install meshio numpy==1.19.5

will report a successful import of meshio version 5.3.4. However, then attempting to import meshio using the Python interpreter:

import meshio

raises ModuleNotFoundError: No module named 'numpy.typing', as per #1283.

Attached is a log replicating this bug using mamba install and using pip.

In practice, I came across this quirk whilst writing the conda-forge recipe for a package that depends on meshio in addition to other packages that require numpy<1.20.0. Pinning the numpy version in this example replicates the "other package" requirements.

Diagnose
I may ask you to cut and paste the output of the following command.

pip freeze | grep meshio

Output is meshio==5.3.4.

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