numpy: pin compatible

[ax3l]

Use best practice.

Might help with https://github.com/conda-forge/staged-recipes/pull/22171, might not...

Checklist

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[ax3l]

@conda-forge-admin, please rerender

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[carterbox]

If you want this package to support numpy=>1.15, then the package spec should be the following:

host:
  - numpy =1.15.*
run:
  - {{ pin_compatible('numpy') }}

This would be detemplated to

host:
  - numpy =1.15.x  # where x is the latest available minor version
run:
  - numpy >=1.15.x,<2

But we prefer if you leave the numpy version blank.

host:
  - numpy
run:
  - {{ pin_compatible('numpy') }}

This would be detemplated to

host:
  - numpy =pinned  # where pinned is the version we set channel wide. It's 1.20 or something.
run:
  - numpy >=pinned,<2

The following is wrong because it makes the runtime requirement unreasonably high.

host:
  - numpy >=1.15
run:
  - {{ pin_compatible('numpy') }}

This would be detemplated to

host:
  - numpy =1.30 # The latest numpy version
run:
  - numpy >=1.30,<2 # This version is too new!

https://conda-forge.org/docs/maintainer/knowledge_base.html#building-against-numpy

[ax3l]

Thanks for the guidance!

I do not understand why the request of a lower version than the pinned one pushes up the pin, but I will simply remove it since there is no risk ending up with an old version on CF :)