Add CUDA 11.5.1 & 11.6

[jakirkham]

Update to CUDA 11.5.1 and add CUDA 11.6

cc @jaimergp

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.

[conda-forge-linter]

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) and found it was in an excellent condition.

[kkraus14]

When we added CUDA versions previously we bumped the package minor version. Should we do so again?

[jakirkham]

Yes thanks for the reminder Keith! 😄

Pushed in the commit above

[jakirkham]

Anything else here? 🙂

[kkraus14]

Thanks @jakirkham!

[jakirkham]

Thank you both! 😀