Rebuild for CFEP-25 noarch: python syntax

[regro-cf-autotick-bot]

This PR updates the recipe to use the noarch: python syntax as described in CFEP-25. Please see our documentation for more details.

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[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ Recipes should usually depend on matplotlib-base as opposed to matplotlib so that runtime environments do not require large packages like qt.
• ℹ️ No valid build backend found for Python recipe for package viscm using pip. Python recipes using pip need to explicitly specify a build backend in the host section. If your recipe has built with only pip in the host section in the past, you likely should add setuptools to the host section of your recipe.
• ℹ️ noarch: python recipes should usually follow the syntax in our documentation for specifying the Python version.
  • For the test.requires section of the recipe, you should usually use python {{ python_min }} for the python entry.
  • If the package requires a newer Python version than the currently supported minimum version on conda-forge, you can override the python_min variable by adding a Jinja2 set statement at the top of your recipe (or using an equivalent context variable for v1 recipes).

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[mfisher87]

I really want to make time for this and a couple other viscm tasks soon. Sorry in advance if it takes a couple weeks! ... or more. ❤️