Fix mkl dependency

[isuruf]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Fixes #136

[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...

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[h-vetinari]

The point of #134 was that non-MKL flavours have the <2025 constraint, so that the solver does not get tempted into switching flavours in order to maximize the MKL version.

[isuruf]

We should merge this ASAP to make sure MKL does not get pulled in openblas flavours