Fixed cuda pinning for cuda and pytorch

[das-intensity]

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.

Similar to conda-forge/pytorch_sparse-feedstock#71 the pins for cuda weren't ensuring a consistent version of cuda, resulting in dependency inconsistencies.

Unlike that diff where I pinned cuda to existing cuda packages, I'm adding the cuda-version package with correct pinning to the host section.

[das-intensity]

@conda-forge-admin, please rerender

[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 The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.
• ℹ️ top-level output has some malformed specs:

• In section build: `pytorch ==cuda
• In section host: `pytorch ==cuda
• In section run_constrained: pytorch =*=cuda* Requirement spec fields should always be space-separated to avoid known issues in conda-build. For example, instead of name =version=build, use name version.* build`.

_{This message was generated by GitHub Actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/14070203899. Examine the logs at this URL for more detail.}

[das-intensity]

@conda-forge-admin, please rerender

[h-vetinari]

This LGTM, thanks! As I'm not a maintainer here, let's give @conda-forge/pytorch_scatter a few more days to respond, then I'm happy to merge.